Vulnerability in Microsoft Exchange Server 2013 Cumulative Update 23
CVE-2021-26854
Microsoft Exchange Server Remote Code Execution Vulnerability
EPSS: 0.056 (90.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C.
Affected products
- Microsoft Exchange Server 2013 Cumulative Update 23 — versions 15.00.0
- Microsoft Exchange Server 2016 Cumulative Update 18 — versions 15.01.0
- Microsoft Exchange Server 2016 Cumulative Update 19 — versions 15.01.0
- Microsoft Exchange Server 2019 Cumulative Update 7 — versions 15.02.0
- Microsoft Exchange Server 2019 Cumulative Update 8 — versions 15.02.0
Public proof-of-concept exploits
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26854 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-26854?
- CVE-2021-26854 is a medium-severity vulnerability in Microsoft Exchange Server 2013 Cumulative Update 23. CVSS score: 6.6/10. Published 2021-03-02.
- How severe is CVE-2021-26854?
- Medium severity. CVSS v3 base score is 6.6 out of 10.
- Is CVE-2021-26854 known to be exploited?
- 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.