CVE-2023-34396: Apache Struts: DoS via OOM owing to no sanity limit on normal form fields in multipart forms

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-06-14 · updated 2026-06-17
Weakness: CWE-770

Description

Allocation of Resources Without Limits or Throttling vulnerability in Apache Software Foundation Apache Struts.This issue affects Apache Struts: through 2.5.30, through 6.1.2. Upgrade to Struts 2.5.31 or 6.1.2.1 or greater

Affected products

Apache Struts: before 2.5.31; from 6.0.0 before 6.1.2.1 — fixed in 2.5.31, 6.1.2.1

How to fix

Upgrade to a fixed version: Apache Struts 2.5.31, 6.1.2.1. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2023/06/14/3
https://cwiki.apache.org/confluence/display/WW/S2-064
https://security.netapp.com/advisory/ntap-20230706-0005/
http://www.openwall.com/lists/oss-security/2023/06/14/3
https://cwiki.apache.org/confluence/display/WW/S2-064
https://security.netapp.com/advisory/ntap-20230706-0005/

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