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Vulnerabilities

Vulnerability · CVE-2019-16928

Exim Out-of-bounds Write Vulnerability

Published Sep 27, 2019 · catalog updated Jun 16, 2026 · Exim Exim

Patch now

CVE-2019-16928 is in the CISA known-exploited catalog, due Mar 17, 2022. Confirm Exim Exim against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
41.64%
Remediation
Remediation guidance
Affected products
cpe canonical/ubuntu linux · cpe debian/debian linux · cpe exim/exim · cpe fedoraproject/fedora · vendor Exim Exim · vendor Exim Exim Internet Mailer

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • 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 Eximversion unspecified
  • vendor Exim Exim Internet Mailerversion unspecified

How to fix CVE-2019-16928

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2019-16928 is in the CISA known-exploited catalog, due Mar 17, 2022. Confirm Exim Exim against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with canonical/ubuntu linux 19.04; debian/debian linux 10.0. Apply updates per vendor instructions.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 41.64%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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.

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
  • VulnCheck KEVConfirmed exploitationCVE-2019-16928

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.