CVE-2021-31808

MEDIUM

Squid < 4.15 and 5.x < 5.0.6 - Denial of Service via HTTP Range Request

Title source: llm

Description

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP Range request to trigger this.

References (9)

Core 9

Core References

Mailing List, Third Party Advisory vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/

Mailing List, Third Party Advisory vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/

Mailing List, Third Party Advisory mailing-list

https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html

Mailing List, Third Party Advisory mailing-list

http://www.openwall.com/lists/oss-security/2023/10/11/3

Mailing List, Third Party Advisory mailing-list

http://seclists.org/fulldisclosure/2023/Oct/14

Exploit, Patch, Vendor Advisory

http://www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patch

Patch, Third Party Advisory

https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xf

Third Party Advisory

https://security.netapp.com/advisory/ntap-20210716-0007/

Third Party Advisory vendor-advisory

https://www.debian.org/security/2021/dsa-4924

Scores

CVSS v3 6.5

EPSS 0.0033

EPSS Percentile 56.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE

CWE-190

Status published

Products (6)

debian/debian_linux 9.0

debian/debian_linux 10.0

fedoraproject/fedora 33

fedoraproject/fedora 34

netapp/cloud_manager

squid-cache/squid < 4.15

Published May 27, 2021

Tracked Since Feb 18, 2026