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CVE

CVE-2021-39156

Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across micr

Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with #fragment in the path may bypass Istio’s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8.

As a work around a Lua filter may be written to normalize the path.

HIGH · CVSS 8.1 EPSS 0.00236
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-706Use of Incorrectly-Resolved Name or Reference
CWE-863Incorrect Authorization
▤

Affected Products & Versions

3
istio< 1.9.8
istio>= 1.10.0 and < 1.10.3
istio>= 1.11.0 and < 1.11.1
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go istio.io/istio HIGH fixed in 1.9.8
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD24 Aug 2021 · 11:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
⚑

Vendor Advisories

2
rhsaRHSA-2021:3273Important
rhsaRHSA-2021:3272Important
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4rThird Party Advisory
https://istio.io/latest/news/security/istio-security-2021-008Vendor Advisory
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