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Exploited vulnerability · CISA KEV

Is CVE-2012-0391 exploited? Yes: in CISA KEV since 21 Jan 2022

Gociux · Apache Struts 2 · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2012-0391, Apache Struts 2 Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 21 Jan 2022, 3666 days after it was published. It affects Apache Struts 2. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 21 Jan 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due21 Jul 2022BOD 22-01 deadline

What it is

The ExceptionDelegator component in Apache Struts 2 before 2.2.3.1 contains an improper input validation vulnerability that allows for remote code execution.

VendorApache (41 exploited CVEs in KEV)
ProductStruts 2
VulnerabilityApache Struts 2 Improper Input Validation Vulnerability
WeaknessCWE-20
Published8 Jan 2012
Added to KEV21 Jan 2022
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Struts 2 in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apache 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 8 Jan 2012.
  4. Get told next time. Email alerts when CISA adds a CVE for Apache.

References

Questions

Is CVE-2012-0391 being exploited?

Yes. CISA added CVE-2012-0391 to the Known Exploited Vulnerabilities catalog on 21 Jan 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2012-0391 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-2012-0391?

Apply updates per vendor instructions. Check Apache's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Struts 2 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 · Apache scorecard · act-now radar.

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