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    CVE-2023-50269

    Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is configured. 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.

    Published:Dec 14, 2023
    Last Modified:May 21, 2025
    EPS:Dec 14, 2023
    EPSS Score:0.00921
    CVSS Score:8.6

    Affected Products

    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Squid-cache
    Product
    Squid

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-674 Uncontrolled Recursion

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads

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    References

    http://www.squid-cache.org/Versions/v5/SQUID-2023_10.patch
    http://www.squid-cache.org/Versions/v6/SQUID-2023_10.patch
    https://github.com/squid-cache/squid/security/advisories/GHSA-wgq4-4cfg-c4x3
    https://lists.debian.org/debian-lts-announce/2024/01/msg00003.html
    https://lists.fedoraproject.org/archives/list/[email protected]/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/
    https://security.netapp.com/advisory/ntap-20240119-0005/
    http://www.squid-cache.org/Versions/v5/SQUID-2023_10.patch
    http://www.squid-cache.org/Versions/v6/SQUID-2023_10.patch
    https://github.com/squid-cache/squid/security/advisories/GHSA-wgq4-4cfg-c4x3
    https://lists.debian.org/debian-lts-announce/2024/01/msg00003.html
    https://lists.fedoraproject.org/archives/list/[email protected]/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/
    https://security.netapp.com/advisory/ntap-20240119-0005/

    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