CVE-2023-36745
published 2023-09-12CVE-2023-36745: Microsoft Exchange Server Remote Code Execution Vulnerability
PriorityP181high8CVSS 3.1
AVAACLPRLUINSUCHIHAH
ITWVulnCheck KEV
Exploited in the wild
EPSS
81.14%
99.6th percentile
Microsoft Exchange Server Remote Code Execution Vulnerability
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | microsoft_exchange_server_2016_cumulative_update_23 | >= 15.01.0 < 15.01.2507.032 | 15.01.2507.032 |
| microsoft | microsoft_exchange_server_2019_cumulative_update_12 | >= 15.02.0 < 15.02.1118.037 | 15.02.1118.037 |
| microsoft | microsoft_exchange_server_2019_cumulative_update_13 | >= 15.02.0 < 15.02.1258.025 | 15.02.1258.025 |
| msrc | microsoft_exchange_server_2016_cumulative_update_23 | — | — |
| msrc | microsoft_exchange_server_2019_cumulative_update_12 | — | — |
| msrc | microsoft_exchange_server_2019_cumulative_update_13 | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Exploitation leverages the known Type 4 UnitySerializationHolder gadget via deserialization of untrusted data against Microsoft Exchange Server ↗
- →Attack vector requires LAN access and valid Exchange user credentials (low-privilege authenticated user); scope detection to internal/LAN-originating authenticated Exchange requests ↗
- →Successful exploitation can result in total loss of confidentiality, integrity, and availability — monitor for unexpected Exchange process spawning, data exfiltration, or service downtime following authenticated deserialization activity ↗
- ·Protection requires installation of the August 2023 Exchange security updates; systems already patched with August 2023 updates are protected ↗
CVSS provenance
nvdv3.18.0HIGHCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vulncheck8.0HIGH
vendor_msrc8.0HIGH
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Microsoft
Microsoft Exchange Server Remote Code Execution Vulnerability
vendor_msrc·2023-09-12·CVSS 8.0
CVE-2023-36745 [HIGH] CWE-502 Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
FAQ: According to the CVSS metric, privileges required is low (PR:L). Does the attacker need to be in an authenticated role on the Exchange Server?
Yes, the attacker must be authenticated with LAN-access and have credentials for a valid Exchange user.
FAQ: According to the CVSS metric, successful exploitation of this vulnerability could lead to total loss of confidentiality (C:H), integrity (I:H), and availability (A:H). What does that mean for this vulnerability?
An attacker who successfully exploits this vulnerability could perform a remote attack that could enable access to the victim's information and the ability to alter information. Successful exploitation could also potentially cause downtime for the targeted environmen
GHSA
GHSA-53r8-j48r-2w33: Microsoft Exchange Server Remote Code Execution Vulnerability
ghsa_unreviewed·2023-09-12
CVE-2023-36745 [HIGH] GHSA-53r8-j48r-2w33: Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
VulnCheck
Microsoft Exchange Server Remote Code Execution Vulnerability
vulncheck·2023·CVSS 8.0
CVE-2023-36745 [HIGH] Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
Affected: Microsoft Exchange Server
Required Action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Exploitation References: https://rt-solar.ru/solar-4rays/blog/4333/; https://rt-solar.ru/solar-4rays/blog/4527/
No detection rules found.
No public exploits indexed.
Greynoiseio
GreyNoise Detects Active Exploitation of CVEs Mentioned in Black Basta’s Leaked Chat Logs
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[CRITICAL] GreyNoise Detects Active Exploitation of CVEs Mentioned in Black Basta’s Leaked Chat Logs
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Why GreyNoise
CVE Disclosure Early Warning Get an early warning when traffic spikes indicate a high likelihood of new disclosures
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Qualys
Defense Lessons From the Black Basta Ransomware Playbook
blogs_qualys·2025-02-25
Defense Lessons From the Black Basta Ransomware Playbook
## Table of Contents
Know Your Enemys Playbook
Attackers Move Fast
How Qualys Can Help
The cybersecurity world was rocked last week by a massive leak of Black Basta’s internal communications that emerged from the group’s chat logs. Triggered by internal conflicts and a retaliatory data dump following attacks on Russian banks, the exposed records offer a rare glimpse into Black Basta’s tactics, operations, and leadership.
We’ve analyzed these newly unveiled tactics, and in this blog, we equip security teams with clear, actionable insights. We aim to highlight the key lessons learned—like immediate patching, tighter access controls, and rapid incident response—and provide an urgent call to action. This practical guide aims to help organizations strengthen their defenses against evolving
Qualys
Defense Lessons From the Black Basta Ransomware Playbook | Qualys
blogs_qualys·2025-02-25
Defense Lessons From the Black Basta Ransomware Playbook | Qualys
#### Table of Contents
- Know Your Enemys Playbook
- Attackers Move Fast
- How Qualys Can Help
The cybersecurity world was rocked last week by a massive leak of Black Basta’s internal communications that emerged from the group’s chat logs. Triggered by internal conflicts and a retaliatory data dump following attacks on Russian banks, the exposed records offer a rare glimpse into Black Basta’s tactics, operations, and leadership.
We’ve analyzed these newly unveiled tactics, and in this blog, we equip security teams with clear, actionable insights. We aim to highlight the key lessons learned—like immediate patching, tighter access controls, and rapid incident response—and provide an urgent call to action. This practical guide aims to help organizations strengthen their defenses against ev
Bleepingcomputer
Over 20,000 vulnerable Microsoft Exchange servers exposed to attacks
blogs_bleepingcomputer·2023-12-02
Over 20,000 vulnerable Microsoft Exchange servers exposed to attacks
## Over 20,000 vulnerable Microsoft Exchange servers exposed to attacks
## Ionut Ilascu
Tens of thousands of Microsoft Exchange email servers in Europe, the U.S., and Asia exposed on the public internet are vulnerable to remote code execution flaws.
The mail systems run a software version that is currently unsupported and no longer receives any type of updates, being vulnerable to multiple security issues, some with a critical severity rating.
## Exchange Server 2007 still running
Internet scans from The ShadowServer Foundation show that there are close to 20,000 Microsoft Exchange servers currently reachable over the public internet that have reached the end-of-life (EoL) stage.
On Friday, more than half of the systems were located in Europe. In North America, there were 6,038 Excha
Qualys
Microsoft and Adobe Patch Tuesday, September 2023 Security Update Review
blogs_qualys·2023-09-12
Microsoft and Adobe Patch Tuesday, September 2023 Security Update Review
## Table of Contents
Microsoft Patch Tuesday for September 2023
Adobe Patches for September 2023
Zero-day Vulnerability Patched in September Patch Tuesday Edition
Other Critical Severity Vulnerabilities Patched in September Patch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
Rapid Response with Patch Management (PM)
EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
EXECUTE Mitigation Using Qualys Custom Assessment and Remediation (CAR)
Qualys Monthly Webinar Series
Microsoft has released the Patch Tuesday edition for September. This month’s updates have addressed 66 security vulnerabilities (including Edge Chromium-based) in multip
Bleepingcomputer
Microsoft September 2023 Patch Tuesday fixes 2 zero-days, 59 flaws
blogs_bleepingcomputer·2023-09-12·CVSS 6.5
[MEDIUM] Microsoft September 2023 Patch Tuesday fixes 2 zero-days, 59 flaws
## Microsoft September 2023 Patch Tuesday fixes 2 zero-days, 59 flaws
## Lawrence Abrams
3 Security Feature Bypass Vulnerabilities
24 Remote Code Execution Vulnerabilities
9 Information Disclosure Vulnerabilities
3 Denial of Service Vulnerabilities
5 Spoofing Vulnerabilities
5 Edge - Chromium Vulnerabilities
The total count of 59 flaws does not include five Microsoft Edge (Chromium) vulnerabilities two non-Microsoft flaws in Electron and Autodesk.
To learn more about the non-security updates released today, you can review our dedicated articles on the new Windows 11 KB5030219 cumulative update and Windows 10 KB5030211 updates released.
## Two actively exploited zero-day vulnerabilities
This month's Patch Tuesday fixes two zero-day vulnerabilities, with both exploited in attacks
Talos
Microsoft Patch Tuesday for September 2023 — Unusually low 5 critical vulnerabilities included in Microsoft Patch Tuesday, along with two zero-days
blogs_talos·2023-09-12·CVSS 8.0
[HIGH] Microsoft Patch Tuesday for September 2023 — Unusually low 5 critical vulnerabilities included in Microsoft Patch Tuesday, along with two zero-days
Microsoft disclosed 65 vulnerabilities across its suite of products and software Tuesday, only five of which are considered critical, which is very low compared to Microsoft’s usual security updates.
However, there are two issues disclosed and patched this month that have already been exploited in the wild.
Fifty-six of the vulnerabilities included in this month’s Patch Tuesday are considered “important,” according to Microsoft, while two are of “moderate” severity. One remote code execution vulnerability in Microsoft Exchange Server, CVE-2023-36756, was meant to be included in August’s security update but was mistakenly excluded. Users should ensure the August 2023 security update for Exchange is already downloaded to remediate this issue.
One of the vulnerabilities adversaries are alr
Tenable
Microsoft’s September 2023 Patch Tuesday Addresses 61 CVEs (CVE-2023-36761)
blogs_tenable·2023-09-12·CVSS 6.5
[MEDIUM] Microsoft’s September 2023 Patch Tuesday Addresses 61 CVEs (CVE-2023-36761)
## Cloud Exposure
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## Vulnerability Exposure
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Tenable Patch Management Request a demo
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## AI Exposure
Tenable AI Exposure Request a demo
## OT/IoT Exposure
Tenable OT Security Request a demo
## Identity Exposure
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## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
Cloud Security Posture Man
Talos
Microsoft Patch Tuesday for September 2023 — Unusually low 5 critical vulnerabilities included in Microsoft Patch Tuesday, along with two zero-days
blogs_talos·2023-09-12·CVSS 8.0
[HIGH] Microsoft Patch Tuesday for September 2023 — Unusually low 5 critical vulnerabilities included in Microsoft Patch Tuesday, along with two zero-days
## Microsoft Patch Tuesday for September 2023 — Unusually low 5 critical vulnerabilities included in Microsoft Patch Tuesday, along with two zero-days
Microsoft disclosed 65 vulnerabilities across its suite of products and software Tuesday, only five of which are considered critical, which is very low compared to Microsoft’s usual security updates.
However, there are two issues disclosed and patched this month that have already been exploited in the wild.
Fifty-six of the vulnerabilities included in this month’s Patch Tuesday are considered “important,” according to Microsoft, while two are of “moderate” severity. One remote code execution vulnerability in Microsoft Exchange Server, CVE-2023-36756 , was meant to be included in August’s security update but was mistakenly excluded. Users
Qualys
Microsoft and Adobe Patch Tuesday, September 2023 Security Update Review | Qualys
blogs_qualys·2023-09-12
Microsoft and Adobe Patch Tuesday, September 2023 Security Update Review | Qualys
#### Table of Contents
- Microsoft Patch Tuesday for September 2023
- Adobe Patches for September 2023
- Zero-day Vulnerability Patched in September Patch Tuesday Edition
- Other Critical Severity Vulnerabilities Patched in September Patch Tuesday Edition
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
- Rapid Response with Patch Management (PM)
- EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
- EXECUTE Mitigation Using Qualys Custom Assessment and Remediation (CAR)
- Qualys Monthly Webinar Series
Microsoft has released the Patch Tuesday edition for September. This month’s updates have addressed 66 security vulnerabilities (including Edge Chromium-ba
Sentinelone
Black Basta
blogs_sentinelone·2022-11-30
Black Basta
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Pricing & Packaging Comparisons and Guidance at a Glance
Purple AI Accelerate SecOps with Generative AI
Singularity Hyperautomation Easily Automate Security Processes
AI-SIEM The AI SIEM for the Autonomous SOC
Singularity Data Lake AI-Powered, Unified Data Lake
Singularity Data Lake for Log Analytics Seamlessly Ingest Data from On-Prem, Cloud or Hybrid Environments
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Singularity XDR Native & Open Protection, Detection, and Response
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Threat Intelligence Comprehensive Adversary Intelligence
Singularity Vulnerability Management
Sentinelone
Black Basta
blogs_sentinelone
Black Basta
# Black Basta Ransomware: In-Depth Analysis, Detection, and Mitigation
## Summary of Black Basta Ransomware
Black Basta first emerged in early 2022. The ransomware family is an evolution of the Hermes/Ryuk/Conti families. Black Basta was heavily advertised in underground cybercrime markets. Black Basta practices double extortion – demanding payment for a decryptor, as well as for the non-release of stolen data. There are Windows and LInux variants of Black Basta ransomware. The group is responsible for hundreds of attacks against global targets of varying sectors.
February 2025 Update: Nearly a year’s worth of Black Basta chat logs have been released on Telegram, providing detailed insight into the groups operational workflow, reconnaissance activities, and specific userID and details o
2023-09-12
Published
Exploited in the wild