CVEs / CVE-2019-10149

CVE-2019-10149: Exim Mail Transfer Agent (MTA) Improper Input Validation

Known exploited in the CISA KEV catalog since 10 Jan 2022
critical 9.8 CVSS 3.1 (NVD)
EPSS 99.9% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
Last changed at its sources 24 Oct 2026

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Summary

Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command execution.
CISA, Known Exploited Vulnerabilities catalog

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.
The CVE record, via NVD · published 5 Jun 2019 · NVD status: Analyzed

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
exim exim	4.92	—

Exploitation

In CISA KEV since	10 Jan 2022
Due date for US federal agencies	10 Jul 2022
Used in ransomware campaigns	Unknown
Required action	Apply updates per vendor instructions.

Severity

CVSS 3.1	9.8 critical `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Scored by NVD
Weakness	CWE-78

References

CVE-2019-10149 on NVD
CVE-2019-10149 in the CISA KEV catalog
CVE-2019-10149 on OSV
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00020.html Mailing List, Third Party Advisory
http://packetstormsecurity.com/files/153218/Exim-4.9.1-Remote-Command-Execution.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/153312/Exim-4.91-Local-Privilege-Escalation.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/154198/Exim-4.91-Local-Privilege-Escalation.html Exploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2019/Jun/16 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/06/05/2 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/06/05/3 Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/06/05/4 Exploit, Mailing List
http://www.openwall.com/lists/oss-security/2019/06/06/1 Exploit, Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/07/25/6 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/07/25/7 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/07/26/4 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/04/7 Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/108679 Broken Link, Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10149 Issue Tracking, Third Party Advisory
https://seclists.org/bugtraq/2019/Jun/5 Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/201906-01 Third Party Advisory
https://usn.ubuntu.com/4010-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4456 Third Party Advisory
https://www.exim.org/static/doc/security/CVE-2019-10149.txt Vendor Advisory

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.