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Exploited vulnerability · CISA KEV

Is CVE-2019-16928 exploited? Yes: in CISA KEV since 3 Mar 2022

Gociux · Exim Internet Mailer · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-16928, Exim Out-of-bounds Write Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Mar 2022, 888 days after it was published. It affects Exim Internet Mailer. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity9.8CVSS 3.1 · critical
US federal due17 Mar 2022BOD 22-01 deadline

What it is

Exim contains an out-of-bounds write vulnerability which can allow for remote code execution.

VendorExim (5 exploited CVEs in KEV)
ProductExim Internet Mailer
VulnerabilityExim Out-of-bounds Write Vulnerability
WeaknessCWE-787
Published27 Sep 2019
Added to KEV3 Mar 2022
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Exim Internet Mailer 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 27 Sep 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Exim.

References

Questions

Is CVE-2019-16928 being exploited?

Yes. CISA added CVE-2019-16928 to the Known Exploited Vulnerabilities catalog on 3 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-16928 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-2019-16928?

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 Exim Internet Mailer 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 March 2022 · Exim scorecard · act-now radar.

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