Name: CVE-2021-31805: Improper Neutralization of Special Elements used in an Expression Language Statement
Creator: Rapid7
Published: 2022-04-12T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2021-31805, CWE-917, CVSS 9.8, EPSS 0.93956

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.

CVSS Details

CVSS 3.1 Base Score: 9.8
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
F5 Big Ip	—	Update F5 BIG-IP to the latest version	Jun 17, 2026	Dec 22, 2020
Struts	—	Upgrade to Apache Struts version 2.5.30	Apr 25, 2022	Apr 12, 2022

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CVSS Details

Covered by Rapid7

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