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PatchSiren cyber security CVE debrief

CVE-2019-10149 Exim CVE debrief

CVE-2019-10149 is a security issue in Exim Mail Transfer Agent (MTA) described as improper input validation. CISA has included it in the Known Exploited Vulnerabilities catalog, which means it should be treated as a priority issue for defenders, especially on systems exposed to untrusted network traffic. The available source corpus does not provide deeper technical detail, so the safest response is to verify affected Exim deployments and apply the vendor-recommended updates as soon as possible.

Vendor
Exim
Product
Mail Transfer Agent (MTA)
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-01-10
Original CVE updated
2022-01-10
Advisory published
2022-01-10
Advisory updated
2022-01-10

Who should care

Exim administrators, email infrastructure owners, security operations teams, vulnerability management teams, and incident responders responsible for internet-facing mail systems.

Technical summary

The supplied official sources identify CVE-2019-10149 as an improper input validation issue in Exim Mail Transfer Agent. CISA’s KEV entry marks the vulnerability as known to be exploited and directs defenders to apply updates per vendor instructions. Because the source corpus is limited, no additional implementation detail or exploit behavior is asserted here.

Defensive priority

High

Recommended defensive actions

  • Identify all systems running Exim Mail Transfer Agent, including appliances and embedded mail gateways.
  • Check the exact Exim version and determine whether it is affected by CVE-2019-10149 using vendor guidance.
  • Apply the vendor-recommended updates or mitigations immediately on exposed systems.
  • Prioritize internet-facing mail servers and any system that processes untrusted email traffic.
  • Review monitoring, alerting, and incident response coverage around Exim hosts for signs of abuse or exploitation.
  • Track remediation status through vulnerability management and verify fixes after patching.

Evidence notes

This debrief is based only on the supplied corpus and official links: the CISA KEV catalog entry identifies CVE-2019-10149 as an Exim MTA improper input validation issue and notes the required action to apply updates per vendor instructions. The corpus does not include a vendor bulletin or additional technical write-up, so no unsupported impact details are included.

Official resources

Publicly disclosed vulnerability with a CISA KEV listing indicating known exploitation. No exploit instructions or reproduction details are provided here.