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CVE-2021-31196: Microsoft Exchange Server Information Disclosure Vulnerability

criticalknown exploitedpublic exploitCVE-2021-31196
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 contains an information disclosure vulnerability that allows for remote code execution.

CSIRTS triage

vendor: Microsoftproduct: Exchange ServerInformation disclosureRemote code execution
What
An information disclosure vulnerability allows for remote code execution.
Who is affected
Microsoft Exchange Server deployments are affected.
Urgency
Immediate remediation is necessary as the vulnerability is actively exploited and rated critical.
Action
Apply the latest security updates to Exchange Server.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2024-08-21
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-31196

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-2021-31196coverage & 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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