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Exploited vulnerability · CISA KEV

Is CVE-2010-4344 exploited? Yes: in CISA KEV since 25 Mar 2022

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

Yes. CVE-2010-4344, Exim Heap-Based Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 Mar 2022, 4119 days after it was published. It affects Exim. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 25 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due15 Apr 2022BOD 22-01 deadline

What it is

Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session.

VendorExim (5 exploited CVEs in KEV)
ProductExim
VulnerabilityExim Heap-Based Buffer Overflow Vulnerability
WeaknessCWE-119
Published14 Dec 2010
Added to KEV25 Mar 2022
Reported by (CNA)redhat

What to do

  1. Check whether you run it. Look for Exim 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 14 Dec 2010.
  4. Get told next time. Email alerts when CISA adds a CVE for Exim.

Other exploited CVEs in Exim

References

Questions

Is CVE-2010-4344 being exploited?

Yes. CISA added CVE-2010-4344 to the Known Exploited Vulnerabilities catalog on 25 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2010-4344 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-2010-4344?

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 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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