Cyber Resilience

CVE-2021-31805

CriticalRCE

Published: 12 April 2022

Published
12 April 2022
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.9379 99.9th percentile
Risk Priority 76 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-31805 is a critical-severity Expression Language Injection (CWE-917) vulnerability in Apache Struts. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 0.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

evaluation on untrusted user input can lead to a Remote Code Execution and security degradation.

CWE(s)
CWE-917

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

apache
struts
2.0.0 — 2.5.29

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References