Exim Out-of-bounds Write Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Sep 27, 2019 · Catalog

   Detected

   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.

2. Mar 3, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Mar 17, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   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.

Affected

• cpe canonical/ubuntu linux19.04
• cpe debian/debian linux10.0
• cpe exim/eximversion unspecified
• cpe fedoraproject/fedora29
• cpe fedoraproject/fedora30
• cpe fedoraproject/fedora31
• vendor Exim Exim Internet Mailerversion unspecified

Sources

• CISA KEVConfirmed exploitationCVE-2019-16928

  Exim contains an out-of-bounds write vulnerability which can allow for remote code execution.

  cisa.gov
• CVE.orgVulnerability recordCVE-2019-16928

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2019-16928

  30-day exploitation probability 41.6%

  first.org
• NIST NVDVulnerability recordCVE-2019-16928

  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.

  nvd.nist.gov

References

• Exploit · openwall.com
• Exploit · openwall.com
• Mailing List · openwall.com
• Mailing List · openwall.com
• Issue Tracking · bugs.exim.org
• Vendor Advisory · lists.exim.org
• CISA note · nvd.nist.gov