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

> CVE-2019-16928: Exim Out-of-bounds Write Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2019-16928
Last updated: 2025-10-21T23:45:29Z

- Published: 2019-09-27 20:07 UTC · Updated: 2025-10-21 23:45 UTC · Assigner: mitre
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 41.6%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-03-03, federal due date 2022-03-17, ransomware use: Unknown

## Description

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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Exim: Exim Internet Mailer

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2019-16928)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2019-16928)
- [https://bugs.exim.org/show\_bug.cgi?id=2449](https://bugs.exim.org/show_bug.cgi?id=2449)
- [https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f](https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f)
- [https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html](https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EED7HM3MFIBAP5OIMJAFJ35JAJABTVSC/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/EED7HM3MFIBAP5OIMJAFJ35JAJABTVSC/)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T3TJW4HPYH3O5HZCWGD6NSHTEBTTAPDC/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/T3TJW4HPYH3O5HZCWGD6NSHTEBTTAPDC/)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UY6HPRW7MR3KBQ5JFHH6OXM7YCZBJCOB/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/UY6HPRW7MR3KBQ5JFHH6OXM7YCZBJCOB/)
- [https://seclists.org/bugtraq/2019/Sep/60](https://seclists.org/bugtraq/2019/Sep/60)
- [https://security.gentoo.org/glsa/202003-47](https://security.gentoo.org/glsa/202003-47)
- [https://usn.ubuntu.com/4141-1/](https://usn.ubuntu.com/4141-1/)
- [https://www.debian.org/security/2019/dsa-4536](https://www.debian.org/security/2019/dsa-4536)
- [http://www.openwall.com/lists/oss-security/2019/09/28/1](http://www.openwall.com/lists/oss-security/2019/09/28/1)
- [http://www.openwall.com/lists/oss-security/2019/09/28/2](http://www.openwall.com/lists/oss-security/2019/09/28/2)
- [http://www.openwall.com/lists/oss-security/2019/09/28/3](http://www.openwall.com/lists/oss-security/2019/09/28/3)
- [http://www.openwall.com/lists/oss-security/2019/09/28/4](http://www.openwall.com/lists/oss-security/2019/09/28/4)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2019-16928 · Markdown: https://rewindex.com/cve/CVE-2019-16928.md · JSON: https://rewindex.com/api/v1/cves/CVE-2019-16928 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:32.394Z