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CVE-2019-10149

Exim Mail Transfer Agent (MTA) Improper Input Validation

  • Critical 9.0
  • Exploited: added to CISA KEV 10 Jan 2022

Description

A flaw was found in Exim versions 4.87 to 4.91 (inclusive). Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command execution.

Key facts

Published
5 Jun 2019
Last changed
21 Oct 2025
Assigned by
redhat
KEV added
10 Jan 2022
KEV fix due
10 Jul 2022
EPSS
99.961% likely to be exploited in the next 30 days, higher than 99.976% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

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

  • 9.0CVSS 3.0, Criticalfrom the CNA (redhat)CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/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
eximexim
  • 4.92 (affected)

Timeline

  1. 5 Jun 2019 Published
  2. 10 Jan 2022 CVE-2019-10149 added to CISA KEV
  3. 10 Jan 2022 Added to the CISA KEV catalogue

Weakness

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References