CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2021-39156
High (7.5) in istio istio. EPSS 1.2% chance of exploitation in the next 30 days. Fixed in istio.io/istio 1.10.4, 1.11.1, 1.9.8.
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.
Severity
- EPSS
- 1.2% chance of exploitation in the next 30 days; higher than 67% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-706, CWE-863
- Published
- Modified
- Record from
- the NVD, synced
Affected
- istio:istio
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-hqxw-mm44-gc4r | Go | istio.io/istio | <1.9.8 | 1.9.8 |
| GHSA-hqxw-mm44-gc4r | Go | istio.io/istio | >=1.10.0 <1.10.4 | 1.10.4 |
| GHSA-hqxw-mm44-gc4r | Go | istio.io/istio | >=1.11.0 <1.11.1 | 1.11.1 |