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Exploitation reportedNot in CISA KEV yetFix available

CVE-2021-31805

Exploitation reported by one source. First attested on 2026-06-12 by GCVE · kevintel.

  • Published2022-04-12
  • WeaknessCWE-917

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-04-1216:15CVE publishedNVD
  2. 2026-06-1200:32Listed as exploited by GCVEGCVE
  3. 2026-06-1200:32Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-31805?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-31805?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Apache struts
BranchAffectedFixed in
2.x≥ 2.0.0, ≤ 2.5.29no fix published
struts2-core
BranchAffectedFixed in
2.x≥ 2.0.0, < 2.5.302.5.30

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2021-31805 Red Hat Product Security

    Struts: Forced OGNL evaluation, when evaluated on raw not validated user input in tag attributes, may lead to RCE.

Full record on NVD

Fix

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
8 repositories, unverifiedpyroxenites/s2-062Wrin9/CVE-2021-31805SecNN/Struts2_S2-062_CVE-2021-31805jax7sec/S2-062aeyesec/CVE-2021-31805
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2022-04-12
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-v8j6-6c2r-r27c

Frequently asked questions

What is CVE-2021-31805?

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.

Is CVE-2021-31805 actively exploited?

Active exploitation of CVE-2021-31805 has not been confirmed. Its EPSS score was 85.4% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-31805?

CVE-2021-31805 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record