CISA KEV catalog
Confirmed active exploitation.
Listed in CISA's catalog of Known Exploited Vulnerabilities: attackers are using it in real attacks. Patch it with priority.
- Name
- Exim Out-of-bounds Write Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
Description
Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than CVE-2019-15846. There is a heap-based buffer overflow in string_vformat in string.c involving a long EHLO command.
Affected products
exim: exim; canonical: ubuntu linux; debian: debian linux; fedoraproject: fedora
References10
- bugs.exim.org/show_bug.cgi?id=2449 Issue TrackingPatchVendor Advisory
- lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html Vendor Advisory
- bugs.exim.org/show_bug.cgi?id=2449 Issue TrackingPatchVendor Advisory
- lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html Vendor Advisory
- git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d136… Patch
- git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d136… Patch
- www.openwall.com/lists/oss-security/2019/09/28/1 ExploitMailing ListMitigationThird Party Advisory
- www.openwall.com/lists/oss-security/2019/09/28/2 ExploitMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2019/09/28/1 ExploitMailing ListMitigationThird Party Advisory
- www.openwall.com/lists/oss-security/2019/09/28/2 ExploitMailing ListThird Party Advisory
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 42% percentile: 99 · as of 10 November 2026
- CWE
- CWE-787
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