CVE-2021-43557

    Dashboard / Vulnerabilities / CVE-2021-43557

    CVE-2021-43557

    Published: 22 Nov 2021Last Modified: 9 Jul 2026

    Summary:

    Details: The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains "^/internal/", a URI like `//internal/` can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer's custom plugin.

    References: http://www.openwall.com/lists/oss-security/2021/11/22/1, http://www.openwall.com/lists/oss-security/2021/11/22/2, http://www.openwall.com/lists/oss-security/2021/11/23/1, https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -19587ed9f71dd20c5e8dbdc2f79c8f96296e73e3

    Affected versions

    2.10.1
    2.10.0

    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-2021-43557 | CVE-DB