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CVE-2021-31806

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Date: May 26, 2021

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request processing.

Language: C++

Severity Score

Related Resources (18)

http://www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patch
https://security.netapp.com/advisory/ntap-20210716-0007/
https://access.redhat.com/security/cve/CVE-2021-31806
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html
http://seclists.org/fulldisclosure/2023/Oct/14
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
https://security.alpinelinux.org/vuln/CVE-2021-31806
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xf
https://github.com/squid-cache/squid/commit/7024fb734a59409889e53df2257b3fc817809fb4
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-31806
https://nvd.nist.gov/vuln/detail/CVE-2021-31806
https://www.debian.org/security/2021/dsa-4924
https://security-tracker.debian.org/tracker/CVE-2021-31806
http://www.openwall.com/lists/oss-security/2023/10/11/3
https://www.mend.io/vulnerability-database/CVE-2021-31806

Severity Score

Weakness Type (CWE)

Improper Encoding or Escaping of Output

CWE-116

Top Fix

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Upgrade Version

Upgrade to version squid - 4.15, 5.0.6

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): SINGLE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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