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CVE-2019-16928

Exim Out-of-bounds Write Vulnerability

  • Critical 9.8
  • Exploited: added to CISA KEV 3 Mar 2022

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.

Key facts

Published
27 Sep 2019
Last changed
21 Oct 2025
Assigned by
mitre
KEV added
3 Mar 2022
KEV fix due
17 Mar 2022
EPSS
41.638% likely to be exploited in the next 30 days, higher than 98.705% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.8CVSS 3.1, Criticalfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
n/an/a
  • n/a (affected)

Timeline

  1. 27 Sep 2019 Published
  2. 3 Mar 2022 CVE-2019-16928 added to CISA KEV
  3. 3 Mar 2022 Added to the CISA KEV catalogue

Weakness

References