CVE-2021-31920

6.5 mediumEPSS 1.3%

Medium (6.5) in istio istio. EPSS 1.3% chance of exploitation in the next 30 days.

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 used.

Severity

CVSS 3.1

6.5 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS: 1.3% chance of exploitation in the next 30 days; higher than 70% of CVEs (scores of 2026-10-31)
CWE: CWE-706
Published: 2021-05-27
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

istio:istio

References

https://istio.io/latest/news/security/istio-security-2021-005/
https://istio.io/latest/news/security/istio-security-2021-005/

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