CVE-2021-31196
Microsoft Exchange Server Information Disclosure Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 11 September 2024). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
- CVSS 3.1
- 7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 54.06% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 21 August 2024 · due 11 September 2024
- Affected
- microsoft/exchange server
- Source
- secure@microsoft.com
EPSS 54.1% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-31196; https://nvd.nist.gov/vuln/detail/CVE-2021-31196
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31196Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31196US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.