Back to CVE Browser

CVE-2021-31207

🔥 Known Exploited (CISA KEV)MEDIUM

6.6

CVSS Severity Score

EPSS Score78.6660%

EPSS Percentile94.66th

Published2021-05-11

Last Modified2025-10-30

Data SourcesNVDCISA KEVFIRST.org EPSS

Vulnerability Description

Microsoft Exchange Server Security Feature Bypass Vulnerability

Affected Platforms (CPE)

📦

Microsoft

Exchange Server

= 2013= 2016= 2019

References & Advisories

🔗 http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html

🔗 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207

🔗 https://www.zerodayinitiative.com/advisories/ZDI-21-819/

🔗 http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html

🔗 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207

🔗 https://www.zerodayinitiative.com/advisories/ZDI-21-819/

🔗 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31207

Related Security Intelligence Articles

Daily Global Cyber Threat Intelligence Digest — July 29, 2026

Today’s threat intelligence covers active exploitation of Arista VeloCloud CVE-2026-16812, unauthenticated TeamCity RCE CVE-2026-63077, exposed IPMI/BMC password risks, and the Origin Energy and MCBS breach updates.

Daily Global Cyber Threat Intelligence Digest — July 28, 2026

Today’s threat intelligence covers the Certighost CVE-2026-54121 AD CS domain-takeover chain, vBulletin CVE-2026-61511 pre-auth RCE, the expanding Dysphoria botnet, and the DentaQuest and Fairlife breach updates.

Weekly Cybersecurity News: Jul 27, 2026

Weekly cybersecurity news covering active exploitation of Check Point SmartConsole CVE-2026-16232, Qilin ransomware leveraging PAN-OS GlobalProtect vulnerabilities, Russian LAUNDRY BEAR targeting Zimbra email servers, and FakeGit malicious repositories.

Related Vulnerabilities

CVE-2026-659756.5

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. In versions 1.88.0 up to but n...

CVE-2026-542496.8

Pydantic AI is a Python agent framework for building Generative AI applications. In versions 1.65.0 through 1.105.0, and 2.0.0b1 t...

Jinher OA C6 contains an XML External Entity (XXE) injection vulnerability in the /c6/JHSoft.Web.HrmAttendance/sp_manager_getUserl...

CVE-2026-674356.0

linuxfabrik-lib provides Python modules for database access, caching, shell execution, and API integrations. Prior to version 6.0....