Cyber Resilience

CVE-2021-31920

MediumPublic PoC

Published: 27 May 2021

Published
27 May 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS Score 0.0019 40.9th percentile
Risk Priority 13 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-31920 is a medium-severity Use of Incorrectly-Resolved Name or Reference (CWE-706) vulnerability in Istio Istio. Its CVSS base score is 6.5 (Medium).

Operationally, ranked at the 40.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are…

more

used.

CWE(s)
CWE-706

Related Threats

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

Affected Assets

istio
istio
≤ 1.8.6 · 1.9.0 — 1.9.5

Mitigating Controls

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

References