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    CVE-2024-23638

    Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6 is vulnerable to a Denial of Service attack against Cache Manager error responses. This problem allows a trusted client to perform Denial of Service when generating error pages for Client Manager reports. Squid older than 5.0.5 have not been tested and should be assumed to be vulnerable. All Squid-5.x up to and including 5.9 are vulnerable. All Squid-6.x up to and including 6.5 are vulnerable. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. As a workaround, prevent access to Cache Manager using Squid's main access control: `http_access deny manager`.

    Published:Jan 23, 2024
    Last Modified:Jun 17, 2025
    EPS:Jan 23, 2024
    EPSS Score:0.14136
    CVSS Score:6.5

    Affected Products

    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Squid-cache
    Product
    Squid

    Exploits

    https://megamansec.github.io/Squid-Security-Audit/stream-assert.htmlhttps://megamansec.github.io/Squid-Security-Audit/stream-assert.html

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    http://www.squid-cache.org/Versions/v5/SQUID-2023_11.patch
    http://www.squid-cache.org/Versions/v6/SQUID-2023_11.patch
    https://github.com/squid-cache/squid/commit/290ae202883ac28a48867079c2fb34c40efd382b
    https://github.com/squid-cache/squid/commit/e8118a7381213f5cfcdeb4cec1d2d854bfd261c8
    https://github.com/squid-cache/squid/security/advisories/GHSA-j49p-553x-48rx
    https://lists.fedoraproject.org/archives/list/[email protected]/message/7R4KPSO3MQT3KAOZV7LC2GG3CYMCGK7H/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/XWQHRDRHDM5PQTU6BHH4C5KGL37X6TVI/
    https://megamansec.github.io/Squid-Security-Audit/stream-assert.html
    https://security.netapp.com/advisory/ntap-20240208-0010/
    http://www.squid-cache.org/Versions/v5/SQUID-2023_11.patch
    http://www.squid-cache.org/Versions/v6/SQUID-2023_11.patch
    https://github.com/squid-cache/squid/commit/290ae202883ac28a48867079c2fb34c40efd382b
    https://github.com/squid-cache/squid/commit/e8118a7381213f5cfcdeb4cec1d2d854bfd261c8
    https://github.com/squid-cache/squid/security/advisories/GHSA-j49p-553x-48rx
    https://lists.fedoraproject.org/archives/list/[email protected]/message/7R4KPSO3MQT3KAOZV7LC2GG3CYMCGK7H/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/XWQHRDRHDM5PQTU6BHH4C5KGL37X6TVI/
    https://megamansec.github.io/Squid-Security-Audit/stream-assert.html
    https://security.netapp.com/advisory/ntap-20240208-0010/

    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