Vulnerability in Apache Tomcat

CVE-2020-1938

When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are…

EPSS: 0.993 (99.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2020-1938?
CVE-2020-1938 is a critical-severity vulnerability in Apache Tomcat. CVSS score: 9.8/10. Published 2020-02-24.
How severe is CVE-2020-1938?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-1938 known to be exploited?
Yes. CVE-2020-1938 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating it is being actively exploited. 286 public proof-of-concept repositories are indexed.