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Exploited vulnerability · CISA KEV

Is CVE-2019-10149 exploited? Yes: in CISA KEV since 10 Jan 2022

Gociux · Exim Mail Transfer Agent (MTA) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-10149, Exim Mail Transfer Agent (MTA) Improper Input Validation, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Jan 2022, 950 days after it was published. It affects Exim Mail Transfer Agent (MTA). If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 10 Jan 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9CVSS 3.0 · critical
US federal due10 Jul 2022BOD 22-01 deadline

What it is

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

VendorExim (5 exploited CVEs in KEV)
ProductMail Transfer Agent (MTA)
VulnerabilityExim Mail Transfer Agent (MTA) Improper Input Validation
WeaknessCWE-78
Published5 Jun 2019
Added to KEV10 Jan 2022
Reported by (CNA)redhat

What to do

  1. Check whether you run it. Look for Mail Transfer Agent (MTA) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Exim CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 5 Jun 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Exim.

References

Questions

Is CVE-2019-10149 being exploited?

Yes. CISA added CVE-2019-10149 to the Known Exploited Vulnerabilities catalog on 10 Jan 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-10149 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2019-10149?

Apply updates per vendor instructions. Check Exim's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Mail Transfer Agent (MTA) and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in January 2022 · Exim scorecard · act-now radar.

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