CVE-2019-16928: Exim Out-of-bounds Write Vulnerability

CVE-2019-16928 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2022-03-03

Exim contains a heap-based buffer overflow in the string_vformat function in string.c. The vulnerability is triggered by a long EHLO command, allowing for remote code execution.

Technologies: Exim. Vendors: Exim.

Quick answers

Is CVE-2019-16928 exploited in the wild?
Yes. CVE-2019-16928 is known to be exploited in the wild, first recorded on 3 March 2022. Treat it as urgent.
How severe is CVE-2019-16928?
Critical severity, with a CVSS score of 9.8, published 3 March 2022.
Which products and versions are affected?
Exim Exim 4.92 through 4.92.2.
Is there a fix for CVE-2019-16928?
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-2019-16928 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2019-16928?
Check whether you run Exim or Exim Internet Mailer. 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 4.92 through 4.92.2

Timeline

  • 2019-09-27: advisory: Vendor advisory published via mailing list
  • 2022-03-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2022-03-03: disclosed: NVD publication date

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