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CVE-2020-0688: Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2020-0688
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Exchange Server Validation Key fails to properly create unique keys at install time, allowing for remote code execution.

CSIRTS triage

vendor: Microsoftproduct: Exchange ServerRemote code execution
What
Microsoft Exchange Server Validation Key fails to properly create unique keys at install time, allowing for remote code execution.
Who is affected
Deployments of Microsoft Exchange Server.
Urgency
Urgent remediation is necessary as this vulnerability is actively exploited and critical in severity.
Action
Apply the latest security updates from Microsoft.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-0688

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-0688coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Exchange Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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