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CVE-2010-4344

9.8 · CRITICALActively Exploited

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 co…

Published Dec 14, 2010eximCWE-787EPSS 71.71%

Overview

CVE-2010-4344 is a critical-severity vulnerability affecting exim exim. It was published on December 14, 2010 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from exim. Update exim to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
eximexim>= 0, < 4.70Affected

References

Refftp://ftp.exim.org/pub/exim/ChangeLogs/ChangeLog-4.70Refatmail.com/blog/2010/atmail-6204-now-available/Refbugs.exim.org/show_bug.cgi?id=787Refgit.exim.org/exim.git/commit/24c929a27415c7cfc7126c47e4cad39acf3efa6bReflists.exim.org/lurker/message/20101210.164935.385e04d0.en.htmlReflists.opensuse.org/opensuse-security-announce/2010-12/msg00003.htmlRefopenwall.com/lists/oss-security/2010/12/10/1Refsecunia.com/advisories/40019Refsecunia.com/advisories/42576Refsecunia.com/advisories/42586

How CyberStrike helps

Frequently asked questions

What is CVE-2010-4344?

CVE-2010-4344 is a critical-severity vulnerability affecting exim exim. It was published on December 14, 2010 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2010-4344?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2010-4344?

Check the references section for vendor advisories and patches from exim. Update exim to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2010-4344?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2010-4344 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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