CVE-2021-31920

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    CVE-2021-31920

    Published: 27 May 2021Last Modified: 8 Jul 2026

    Summary:

    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 used.

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

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -1aa9fc7a594d6ffc88ff8fd6cd416d8bafe4b214

    Affected versions

    1.9.4
    1.9.2
    1.9.1
    1.9.0

    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-2021-31920 | CVE-DB