CVE-2021-31805 (GCVE-0-2021-31805)

Vulnerability from cvelistv5 – Published: 2022-04-12 15:25 – Updated: 2024-08-03 23:10
VLAI Previdian
Title
Forced OGNL evaluation, when evaluated on raw not validated user input in tag attributes, may lead to RCE.
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-917 - Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
Assigner
References
Impacted products
Credits
Apache Struts would like to thank Chris McCown for reporting this issue!
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b49098c4-7dc5-4a31-a7fd-9b51cf91fab9

Vulnerability ID: CVE-2021-31805

Status: Confirmed

Status Updated: 2026-06-12 02:32 CEST

Exploited: Yes

Timestamps
First Seen: 2026-06-12
Asserted: 2026-06-12
Scope
Notes: Forced OGNL evaluation, when evaluated on raw not validated user input in tag attributes, may lead to RCE. | Affected: Apache / Apache Struts | CVSS: 9.8 (CRITICAL) | EPSS: 0.85433 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Forced OGNL evaluation, when evaluated on raw not validated user input in tag attributes, may lead to RCE.
Cve Id CVE-2021-31805
Vendor Apache
Ghsa Id GHSA-V8J6-6C2R-R27C
Product Apache Struts
Added Date 2026-06-12T00:32:51.325Z
Cvss Score 9.8
Epss Score 0.85433
Previous Ids
Cvss Severity CRITICAL
Virtual Patch True
Cvss Estimated False
Epss Percentile 0.99715
Used In Malware unknown
Vulnerability Id CVE-2021-31805
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-10-02 09:09 CEST | Updated: 2026-10-02 09:09 CEST
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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