CVE-2010-4344
CRITICAL severity · CVSS 9.8 · Out-of-bounds write · actively exploited (CISA KEV)
9.8CVSS CRITICAL ● exploited
🔴 Actively exploited in the wild (CISA Known Exploited Vulnerabilities).
Added to KEV 2022-03-25. US federal agencies must patch by 2022-04-15.
Summary
Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)52%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Recommendation
This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.
Official patch: http://bugs.exim.org/show_bug.cgi?id=787 ↗
Additional information
- NVD record
- http://bugs.exim.org/show_bug.cgi?id=787Patch
- http://git.exim.org/exim.git/commit/24c929a27415c7cfc7126c47e4cad39acf3efa6bPatch
- http://lists.exim.org/lurker/message/20101210.164935.385e04d0.en.htmlPatch
- http://secunia.com/advisories/40019Advisory
- ftp://ftp.exim.org/pub/exim/ChangeLogs/ChangeLog-4.70
- http://atmail.com/blog/2010/atmail-6204-now-available/
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00003.htmlAdvisory
- http://openwall.com/lists/oss-security/2010/12/10/1Advisory