CVE-2021-39156

    Dashboard / Vulnerabilities / CVE-2021-39156

    CVE-2021-39156

    Published: 24 Aug 2021Last Modified: 9 Jul 2026

    Summary:

    Details: 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.

    References: https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r, https://istio.io/latest/news/security/istio-security-2021-008

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -5336ff0f12bc093b728dac3a729b4b2bcbc3df65

    Affected versions

    1.11.0-rc.4
    1.11.0-rc.3
    1.11.0-rc.2
    1.11.0-rc.1
    1.11.0-beta.3
    1.11.0-beta.2
    1.11.0-beta.1
    1.11.0-beta.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-39156 | CVE-DB