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Exploited vulnerability · CISA KEV

Is CVE-2020-1938 exploited? Yes: in CISA KEV since 3 Mar 2022

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

Yes. CVE-2020-1938, Apache Tomcat Improper Privilege Management Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Mar 2022, 738 days after it was published. It affects Apache Tomcat. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due17 Mar 2022BOD 22-01 deadline

What it is

Apache Tomcat treats Apache JServ Protocol (AJP) connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited.

VendorApache (41 exploited CVEs in KEV)
ProductTomcat
VulnerabilityApache Tomcat Improper Privilege Management Vulnerability
Weaknessnot specified
Published24 Feb 2020
Added to KEV3 Mar 2022
Reported by (CNA)apache

What to do

  1. Check whether you run it. Look for Tomcat 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 24 Feb 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Apache.

Other exploited CVEs in Tomcat

References

Questions

Is CVE-2020-1938 being exploited?

Yes. CISA added CVE-2020-1938 to the Known Exploited Vulnerabilities catalog on 3 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-1938 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-2020-1938?

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 Tomcat 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 · Apache scorecard · act-now radar.

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