CVE-2019-16928 — Exim Out-of-bounds Write Vulnerability
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.
Published
2019-09-27T20:07:12.000Z
Last modified
2025-10-21T23:45:29.725Z
CISA KEV — Actively Exploited
01What is this vulnerability?
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.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Yes — actively exploited. Added to the CISA KEV catalog on 2022-03-03. Ransomware use: Unknown.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
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07Related CVEs
08Timeline
- Published: 2019-09-27T20:07:12.000Z
- Last modified: 2025-10-21T23:45:29.725Z
- Added to CISA KEV: 2022-03-03
- BOD 22-01 due: 2022-03-17
09References
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