CVE-2010-4344: Exim Heap-Based Buffer Overflow Vulnerability

CVE-2010-4344 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2022-03-25

A heap-based buffer overflow exists in the string_vformat function in Exim's string.c. Remote attackers can exploit this via a crafted SMTP session involving multiple MAIL commands and large message headers to execute arbitrary code.

Technologies: Exim. Vendors: Exim.

Quick answers

Is CVE-2010-4344 exploited in the wild?
Yes. CVE-2010-4344 is known to be exploited in the wild, first recorded on 25 March 2022. Treat it as urgent.
How severe is CVE-2010-4344?
Critical severity, with a CVSS score of 9.8, published 25 March 2022.
Which products and versions are affected?
Exim Exim before 4.70.
Is there a fix for CVE-2010-4344?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2010-4344 attacked?
It is attacked over the network, in a hosted service.
Am I affected by CVE-2010-4344?
Check whether you run Exim. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Exim Exim before 4.70

Timeline

  • 2010-12-10: disclosed: Initial public disclosure and mailing list discussions.
  • 2022-03-25: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.
  • 2022-03-25: exploited: Reported as exploited in the wild.

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