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Vulnerabilities

Vulnerability · CVE-2019-10149

Exim Mail Transfer Agent (MTA) Improper Input Validation

Published Jun 5, 2019 · catalog updated Jun 16, 2026 · Exim Mail Transfer Agent (MTA)

Patch now

CVE-2019-10149 is in the CISA known-exploited catalog, due Jul 10, 2022. Confirm Exim Mail Transfer Agent (MTA) 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
99.96%
Remediation
Remediation guidance
Affected products
cpe canonical/ubuntu linux · cpe debian/debian linux · cpe exim/exim · vendor Exim Mail Transfer Agent (MTA)

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.

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 linux18.04
  • cpe canonical/ubuntu linux18.10
  • cpe debian/debian linux9.0
  • cpe exim/eximversion unspecified
  • vendor Exim Mail Transfer Agent (MTA)version unspecified

How to fix CVE-2019-10149

What to do

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

Should you patch?

CVE-2019-10149 is in the CISA known-exploited catalog, due Jul 10, 2022. Confirm Exim Mail Transfer Agent (MTA) 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 18.04; canonical/ubuntu linux 18.10; debian/debian linux 9.0. Apply updates per vendor instructions.

What should an analyst verify?

CWE-78: OS Command Injection. EPSS 99.96%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. 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. Jun 5, 2019 · Catalog

    Detected

    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.

  2. Jan 10, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Jul 10, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2019-10149

    Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command execution.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2019-10149

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2019-10149

    30-day exploitation probability 100.0%

    first.org
  • Exploit DatabasePublic exploit reference46996

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • Exploit DatabasePublic exploit reference47307

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • Metasploit ModulesPublic exploit moduleexploit_linux/local/exim4_deliver_message_priv_esc

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDVulnerability recordCVE-2019-10149

    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.

    nvd.nist.gov
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/153218/Exim-4.9.1-Remote-Command-Execution.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/153312/Exim-4.91-Local-Privilege-Escalation.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/154198/Exim-4.91-Local-Privilege-Escalation.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • VulnCheck KEVConfirmed exploitationCVE-2019-10149

    Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command 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.