[ CVE-2020-0688 · Published 11 Feb 2020 ]
Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability
Exploited · CISA KEV CVSS 8.8
EPSS 100%Fix available
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2021-11-03
- Known to be used in ransomware campaigns
- EPSS: 100% chance of exploitation in the next 30 days (higher than 100% of CVEs)
[ Description ]Official description
A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, aka 'Microsoft Exchange Memory Corruption Vulnerability'.
CISA: Microsoft Exchange Server Validation Key fails to properly create unique keys at install time, allowing for remote code execution.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 3 May 2022): Apply updates per vendor instructions.
- Patch on portal.msrc.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ References ]References
- packetstormsecurity.com/files/156592/Microsoft-Exchange-2019-15.2.221.12-Remote-Code-Ex…ExploitThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/156620/Exchange-Control-Panel-Viewstate-Deserialization.htmlExploitThird Party AdvisoryVDB Entry
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0688PatchVendor Advisory
- www.zerodayinitiative.com/advisories/ZDI-20-258Third Party AdvisoryVDB Entry
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource