CVE-2021-31805

Name: CVE-2021-31805
Creator: NVD / NIST
Published: 2022-04-12T16:15:08.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 85.10%

Last modified Jun 17, 2026

CVE-2021-31805 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The fix issued for CVE-2020-17530 was incomplete. So from Apache Struts 2.0.0 to 2.5.29, still some of the tag’s attributes could perform a double evaluation if a developer applied forced OGNL evaluation by using the %{...} syntax. EPSS estimates a 85.10% chance of exploitation in the next 30 days.

Description

The fix issued for CVE-2020-17530 was incomplete. So from Apache Struts 2.0.0 to 2.5.29, still some of the tag’s attributes could perform a double evaluation if a developer applied forced OGNL evaluation by using the %{...} syntax. Using forced OGNL evaluation on untrusted user input can lead to a Remote Code Execution and security degradation.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

85.10%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Struts	>= 2.0.0, <= 2.5.29

References

http://www.openwall.com/lists/oss-security/2022/04/12/6Mailing List, Mitigation, Third Party Advisory
https://cwiki.apache.org/confluence/display/WW/S2-062Mitigation, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20220420-0001/Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html
http://www.openwall.com/lists/oss-security/2022/04/12/6Mailing List, Mitigation, Third Party Advisory
https://cwiki.apache.org/confluence/display/WW/S2-062Mitigation, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20220420-0001/Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html

Timeline

Published: Apr 12, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31805?

How severe is CVE-2021-31805?

CVE-2021-31805 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 85.10% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31805?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31805?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST