CVE-2021-30661
published 2021-09-08CVE-2021-30661: A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4…
PriorityP186high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
KEVITW
CISA Known Exploited Vulnerabilitydue 2021-11-17
Exploited in the wild
EPSS
4.53%
90.5th percentile
A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
Affected
17 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apple | ios_14.5_and_ipados | — | — |
| apple | ios_and_ipados | >= unspecified < 14.5 | 14.5 |
| apple | ipados | < 14.5 | 14.5 |
| apple | iphone_os | < 12.5.3 | 12.5.3 |
| apple | iphone_os | >= 14.0 < 14.5 | 14.5 |
| apple | macos | >= 11.0 < 11.3 | 11.3 |
| apple | macos | >= unspecified < 11.3 | 11.3 |
| apple | macos | >= unspecified < 12.5 | 12.5 |
| apple | macos_big_sur | — | — |
| apple | safari | < 14.1 | 14.1 |
| apple | safari | >= unspecified < 14.1 | 14.1 |
| apple | tvos | < 14.5 | 14.5 |
| apple | tvos | >= unspecified < 14.5 | 14.5 |
| apple | watchos | < 7.4 | 7.4 |
| apple | watchos | >= unspecified < 7.4 | 7.4 |
| debian | webkit2gtk | < webkit2gtk 2.30.1-1 (bookworm) | webkit2gtk 2.30.1-1 (bookworm) |
| debian | wpewebkit | < webkit2gtk 2.30.1-1 (bookworm) | webkit2gtk 2.30.1-1 (bookworm) |
Detection & IOCsextracted from sources · hover to see the quote
- →Vulnerability is in the WebKit Storage component; trigger vector is processing maliciously crafted web content delivered via a specially crafted website ↗
- →Attack vector is remote/web-based: attacker persuades a victim to visit a specially crafted web site to exploit the use-after-free in WebKit ↗
- →Scope of impact extends beyond Apple products — any HTML parser relying on WebKit (including non-Apple products) may be affected ↗
- →Affected Linux packages to hunt for on unpatched systems: webkitgtk (RHEL 6) and webkitgtk3 (RHEL 7); webkit2gtk3 on RHEL 9 is NOT affected ↗
- →Debian/Ubuntu: flag systems running webkit2gtk versions older than 2.30.1-1 across bookworm, bullseye, sid, trixie, and forky ↗
- ·CVE-2021-30661 is confirmed actively exploited in the wild (CISA KEV listed); treat any unpatched WebKit-based browser or WebKit-dependent application as high-priority ↗
- ·The vulnerability resides specifically in the WebKit Storage sub-component (use-after-free), not the broader WebKit rendering engine — focus audit/detection on storage-related WebKit code paths ↗
- ·Fixed versions for Apple platforms: Safari 14.1, iOS/iPadOS 14.5, iOS 12.5.3, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3 — systems below these versions remain vulnerable ↗
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvdv2.06.8MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P
osv8.8HIGH
vulncheck8.8HIGH
cisa8.8HIGH
vendor_debian8.8HIGH
vendor_redhat8.8HIGH
CVEs like this are exactly what “Exploited This Week” covers.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
CISA
Apple Multiple Products WebKit Storage Use-After-Free Vulnerability
cisa·2021-11-03·CVSS 8.8
CVE-2021-30661 [HIGH] CWE-416 Apple Multiple Products WebKit Storage Use-After-Free Vulnerability
Vulnerability: Apple Multiple Products WebKit Storage Use-After-Free Vulnerability
Affected: Apple Multiple Products
Apple iOS, iPadOS, macOS, tvOS, watchOS, and Safari WebKit Storage contain a use-after-free vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
Required Action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-30661
Remediation Due Date: 2021-11-17
Red Hat
webkitgtk: Use-after-free leading to arbitrary code execution
vendor_redhat·2021-07-28·CVSS 8.8
CVE-2021-30661 [HIGH] CWE-20 webkitgtk: Use-after-free leading to arbitrary code execution
webkitgtk: Use-after-free leading to arbitrary code execution
A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
A flaw was found in the webkitgtk package. Affected versions of this package could allow a remote attacker to execute arbitrary code on the system caused by a use-after-free in the WebKit component. An attacker can execute arbitrary code on the system by persuading a victim to visit a specially crafted Web site.
Package: webkitgtk (Red Hat Enterprise Linux 6) - Affected
Package: webki
Apple
CVE-2021-30661: iOS 14.5 and iPadOS 14.5
vendor_apple·2021-04-26·CVSS 8.8
CVE-2021-30661 [HIGH] CVE-2021-30661: iOS 14.5 and iPadOS 14.5
Apple Security Update: About the security content of iOS 14.5 and iPadOS 14.5
Product: iOS 14.5 and iPadOS
Version: 14.5
CVE: CVE-2021-30661
Component: WebKit Storage
Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
Description: A use after free issue was addressed with improved memory management.
Apple
CVE-2021-30661: macOS Big Sur 11.3
vendor_apple·2021-04-26·CVSS 8.8
CVE-2021-30661 [HIGH] CVE-2021-30661: macOS Big Sur 11.3
Apple Security Update: About the security content of macOS Big Sur 11.3
Product: macOS Big Sur
Version: 11.3
CVE: CVE-2021-30661
Component: WebKit Storage
Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
Description: A use after free issue was addressed with improved memory management.
Debian
CVE-2021-30661: webkit2gtk - A use after free issue was addressed with improved memory management. This issue...
vendor_debian·2021·CVSS 8.8
CVE-2021-30661 [HIGH] CVE-2021-30661: webkit2gtk - A use after free issue was addressed with improved memory management. This issue...
A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
Scope: local
bookworm: resolved (fixed in 2.30.1-1)
bullseye: resolved (fixed in 2.30.1-1)
forky: resolved (fixed in 2.30.1-1)
sid: resolved (fixed in 2.30.1-1)
trixie: resolved (fixed in 2.30.1-1)
GHSA
GHSA-79qq-9x66-f5r5: A use after free issue was addressed with improved memory management
ghsa_unreviewed·2022-05-24
CVE-2021-30661 [HIGH] CWE-416 GHSA-79qq-9x66-f5r5: A use after free issue was addressed with improved memory management
A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
Project0
The More You Know, The More You Know You Don’t Know - Project Zero
project_zero·2022-04-01
CVE-2016-4654 The More You Know, The More You Know You Don’t Know - Project Zero
A Year in Review of 0-days Used In-the-Wild in 2021
Posted by Maddie Stone, Google Project Zero
This is our third annual year in review of 0-days exploited in-the-wild [2020, 2019]. Each year we’ve looked back at all of the detected and disclosed in-the-wild 0-days as a group and synthesized what we think the trends and takeaways are. The goal of this report is not to detail each individual exploit, but instead to analyze the exploits from the year as a group, looking for trends, gaps, lessons learned, successes, etc. If you’re interested in the analysis of individual exploits, please check out our root cause analysis repository.
We perform and share this analysis in order to make 0-day hard. We want it to be more costly, more resource intensive, and overall more difficult for
OSV
CVE-2021-30661: A use after free issue was addressed with improved memory management
osv·2021-09-08·CVSS 8.8
CVE-2021-30661 [HIGH] CVE-2021-30661: A use after free issue was addressed with improved memory management
A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
VulnCheck
Apple Multiple Products WebKit Storage Use-After-Free Vulnerability
vulncheck·2021·CVSS 8.8
CVE-2021-30661 [HIGH] CWE-416 Apple Multiple Products WebKit Storage Use-After-Free Vulnerability
Apple Multiple Products WebKit Storage Use-After-Free Vulnerability
Apple iOS, iPadOS, macOS, tvOS, watchOS, and Safari WebKit Storage contain a use-after-free vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
Affected: Apple Multiple Products
Required Action: Apply updates per vendor instructions.
Exploitation References: https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit; https://support.apple.com/kb/HT212317; https://support.apple.com/kb/HT212318; https://support.apple.com/kb/HT212323; https://support.apple.com/kb/HT212324; https://suppor
No detection rules found.
No public exploits indexed.
Qualys
Qualys Response to CISA Alert: Binding Operational Directive 22-01
blogs_qualys·2021-11-09
Qualys Response to CISA Alert: Binding Operational Directive 22-01
## Table of Contents
Overview
Directive Scope
CISA Catalog of Known Exploited Vulnerabilities
Detect CISAs Vulnerabilities Using Qualys VMDR
Remediation
Federal Enterprises and Agencies Can Act Now
Summary
Getting Started
Start your VMDR 30-day, no-cost trial today
## Overview
On November 3, 2021, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) released a Binding Operational Directive 22-01 , “Reducing the Significant Risk of Known Exploited Vulnerabilities.” This directive recommends urgent and prioritized remediation of the vulnerabilities that adversaries are actively exploiting. It establishes a CISA-managed catalog of known exploited vulnerabilities that carry significant risk to the federal government and establishes requirements for agencies to remediate
Qualys
Qualys Response to CISA Alert: Binding Operational Directive 22-01 | Qualys
blogs_qualys·2021-11-09
Qualys Response to CISA Alert: Binding Operational Directive 22-01 | Qualys
#### Table of Contents
- Overview
- Directive Scope
- CISA Catalog of Known Exploited Vulnerabilities
- Detect CISAs Vulnerabilities Using Qualys VMDR
- Remediation
- Federal Enterprises and Agencies Can Act Now
- Summary
- Getting Started
Start your VMDR 30-day, no-cost trial today
## Overview
On November 3, 2021, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) released a Binding Operational Directive 22-01, “Reducing the Significant Risk of Known Exploited Vulnerabilities.” This directive recommends urgent and prioritized remediation of the vulnerabilities that adversaries are actively exploiting. It establishes a CISA-managed catalog of known exploited vulnerabilities that carry significant risk to the federal government and establishes requirements for agencies to
Qualys
Apple fixes zero-day in iOS and iPadOS 15.0.2 emergency release: Detect and Prioritize Vulnerabilities using VMDR for Mobile Devices
blogs_qualys·2021-10-18·CVSS 7.0
[HIGH] Apple fixes zero-day in iOS and iPadOS 15.0.2 emergency release: Detect and Prioritize Vulnerabilities using VMDR for Mobile Devices
Apple recently released iOS and iPadOS 15.0.2 as an emergency security update that addresses 1 critical zero-day vulnerabilities, which is exploited in wild. Qualys recommends that security teams should immediately update all devices running iOS and iPadOS to the latest version. “ Apple is aware of a report that this issue may have been actively exploited ,” the company said in security advisories .
This year, Apple has released multiple emergency releases to fix the actively exploited vulnerabilities which Apple is aware of a report that this issue may have been actively exploited . Successful exploitation of the vulnerability allows an application to execute arbitrary code with kernel privileges, and spyware like Pegasus can be easily deployed on affect devices, and exploiting other vul
Qualys
Apple fixes zero-day in iOS and iPadOS 15.0.2 emergency release: Detect and Prioritize Vulnerabilities using VMDR for Mobile Devices | Qualys
blogs_qualys·2021-10-18·CVSS 7.0
[HIGH] Apple fixes zero-day in iOS and iPadOS 15.0.2 emergency release: Detect and Prioritize Vulnerabilities using VMDR for Mobile Devices | Qualys
Apple recently released iOS and iPadOS 15.0.2 as an emergency security update that addresses 1 critical zero-day vulnerabilities, which is exploited in wild. Qualys recommends that security teams should immediately update all devices running iOS and iPadOS to the latest version. “Apple is aware of a report that this issue may have been actively exploited,” the company said in security advisories.
This year, Apple has released multiple emergency releases to fix the actively exploited vulnerabilities which Apple is aware of a report that this issue may have been actively exploited. Successful exploitation of the vulnerability allows an application to execute arbitrary code with kernel privileges, and spyware like Pegasus can be easily deployed on affect devices, and exploiting other vulnera
Securelist
IT threat evolution in Q2 2021. PC statistics
blogs_securelist·2021-08-12
IT threat evolution in Q2 2021. PC statistics
Table of Contents
Quarterly figures
Financial threats
Financial threat statistics
Ransomware programs
Quarterly trends and highlights
Attack on Colonial Pipeline and closure of DarkSide
Closure of Avaddon
Clash with Clop
Attacks on NAS devices
Number of new ransomware modifications
Number of users attacked by ransomware Trojans
Geography of ransomware attacks
Top 10 most common families of ransomware Trojans
Miners
Number of new miner modifications
Number of users attacked by miners
Geography of miner attacks
Vulnerable applications used by cybercriminals during cyberattacks
Attacks on macOS
Geography of threats for macOS
IoT attacks
IoT threat statistics
Attacks via web resources
Countries that serve as sources of web-based attacks: Top 10
Countries where users fa
Securelist
IT threat evolution in Q2 2021. PC statistics
blogs_securelist·2021-08-12
IT threat evolution in Q2 2021. PC statistics
Table of Contents
- Quarterly figures
- Financial threats
- Ransomware programs
- Miners
- Vulnerable applications used by cybercriminals during cyberattacks
- Attacks on macOS
- IoT attacks
- Attacks via web resources
- Local threats
Authors
- AMR
These statistics are based on detection verdicts of Kaspersky products received from users who consented to providing statistical data.
## Quarterly figures
According to Kaspersky Security Network, in Q2 2021:
- Kaspersky solutions blocked 1,686,025,551 attacks from online resources across the globe.
- Web antivirus recognized 675,832,360 unique URLs as malicious.
- Attempts to run malware for stealing money from online bank accounts were stopped on the computers of 119,252 unique users.
- Ransomware attacks were defeated on the computers
Qualys
Prevent Pegasus Spyware Attacks with VMDR | Qualys
blogs_qualys·2021-07-23
Prevent Pegasus Spyware Attacks with VMDR | Qualys
#### Table of Contents
- Attack Vectors and Impact of Pegasus Spyware
- VMDR for Mobile Devices Helps Protect from Pegasus Spyware
- Get Started Now
Pegasus spyware is in the news, and it has been used to target devices of critical people from different sectors and countries including journalists, activists, politicians, and business executives. It has been said that a leaked list of 50,000 phone numbers of potential surveillance targets was obtained by Paris-based journalism nonprofit Forbidden Stories and Amnesty International.
Pegasus spyware is a surveillance software created by Israeli cyber intelligence firm NSO Group. Pegasus is one such software developed to gain access to your phone without consent and gather personal and sensitive information and deliver it to the user spying
Qualys
Protect your Devices from Pegasus Spyware using VMDR for Mobile Devices’ Proactive Approach
blogs_qualys·2021-07-23
Protect your Devices from Pegasus Spyware using VMDR for Mobile Devices’ Proactive Approach
## Table of Contents
Attack Vectors and Impact of Pegasus Spyware
VMDR for Mobile Devices Helps Protect from Pegasus Spyware
Get Started Now
Pegasus spyware is in the news, and it has been used to target devices of critical people from different sectors and countries including journalists, activists, politicians, and business executives. It has been said that a leaked list of 50,000 phone numbers of potential surveillance targets was obtained by Paris-based journalism nonprofit Forbidden Stories and Amnesty International.
Pegasus spyware is a surveillance software created by Israeli cyber intelligence firm NSO Group. Pegasus is one such software developed to gain access to your phone without consent and gather personal and sensitive information and deliver it to the user spying on you
https://support.apple.com/en-us/HT212317https://support.apple.com/en-us/HT212318https://support.apple.com/en-us/HT212323https://support.apple.com/en-us/HT212324https://support.apple.com/en-us/HT212325https://support.apple.com/en-us/HT212341https://support.apple.com/en-us/HT212317https://support.apple.com/en-us/HT212318https://support.apple.com/en-us/HT212323https://support.apple.com/en-us/HT212324https://support.apple.com/en-us/HT212325https://support.apple.com/en-us/HT212341https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30661
2021-09-08
Published
2021-11-03
Added to CISA KEV
Exploited in the wild