CVE-2021-21893
published 2021-08-05CVE-2021-21893: A use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 11.0.0.49893. A specially crafted PDF document can…
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
1.90%
77.5th percentile
A use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 11.0.0.49893. A specially crafted PDF document can trigger the reuse of previously freed memory, which can lead to arbitrary code execution. An attacker needs to trick the user to open the malicious file to trigger this vulnerability. Exploitation is also possible if a user visits a specially crafted, malicious site if the browser plugin extension is enabled.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| foxit | pdf_reader | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvdv3.08.8HIGHCVSS:3.0/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
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Talos
Vulnerability Spotlight: Use-after-free vulnerabilities in Foxit PDF Reader
blogs_talos·2021-07-27·CVSS 8.8
CVE-2021-21831 [HIGH] Vulnerability Spotlight: Use-after-free vulnerabilities in Foxit PDF Reader
## Vulnerability Spotlight: Use-after-free vulnerabilities in Foxit PDF Reader
Aleksandar Nikolic of Cisco Talos discovered this vulnerability. Blog by Jon Munshaw.
Cisco Talos recently discovered multiple use-after-free vulnerabilities in the Foxit PDF Reader.
Foxit PDF Reader is one of the most popular PDF document readers currently available. As a complete and feature-rich PDF reader, it supports JavaScript for interactive documents and dynamic forms.
TALOS-2021-1294 (CVE-2021-21831), TALOS-2021-1307 (CVE-2021-21870) and TALOS-2021-1336 (CVE-2021-21893) are all use-after-free vulnerabilities that exist in the PDF Reader that could lead to an adversary gaining the ability to execute arbitrary code on the victim machine. An attacker needs to trick a user into opening a specially craft
Talos
Vulnerability Spotlight: Use-after-free vulnerabilities in Foxit PDF Reader
blogs_talos·2021-07-27·CVSS 8.8
CVE-2021-21831 [HIGH] Vulnerability Spotlight: Use-after-free vulnerabilities in Foxit PDF Reader
Aleksandar Nikolic of Cisco Talos discovered this vulnerability. Blog by Jon Munshaw.
Cisco Talos recently discovered multiple use-after-free vulnerabilities in the Foxit PDF Reader.
Foxit PDF Reader is one of the most popular PDF document readers currently available. As a complete and feature-rich PDF reader, it supports JavaScript for interactive documents and dynamic forms.
TALOS-2021-1294 (CVE-2021-21831), TALOS-2021-1307 (CVE-2021-21870) and TALOS-2021-1336 (CVE-2021-21893) are all use-after-free vulnerabilities that exist in the PDF Reader that could lead to an adversary gaining the ability to execute arbitrary code on the victim machine. An attacker needs to trick a user into opening a specially crafted, malicious PDF to exploit these vulnerabilities.
Cisco Talos worked with Fox
Threat Intel
UNC5330
threat_intel·CVSS 9.1
CVE-2024-21893 [CRITICAL] UNC5330
# Threat Actor: UNC5330
## Description
UNC5330 is a suspected China-nexus espionage actor. UNC5330 has been observed chaining CVE-2024-21893 and CVE-2024-21887 to compromise Ivanti Connect Secure VPN appliances as early as Feb. 2024. Post-compromise activity by UNC5330 includes deployment of PHANTOMNET and TONERJAM. UNC5330 has employed Windows Management Instrumentation (WMI) to perform reconnaissance, move laterally, manipulate registry entries, and establish persistence.
Mandiant observed UNC5330 operating a server since Dec. 6, 2021, which the group used as a GOST proxy to help facilitate malicious tool deployment to endpoints. The default certificate for GOST proxy was observed from Sept. 1, 2022 through Jan. 1, 2024. UNC5330 also attempted to download Fast Reverse Proxy (FRP) from t
2021-08-05
Published