CVE-2021-31806

Published: May 27, 2021Modified: Jun 17, 2026

6.5

Vector

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

Exploitability: 2.8 / Impact: 3.6

Source: NVD

Description

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.

Affected (7)

Products: Squid Cache: Squid · Debian: Debian Linux · Fedoraproject: Fedora · +1 more

Show all products

Squid Cache: Squid · Debian: Debian Linux · Fedoraproject: Fedora · Netapp: Cloud Manager

1 product

1 product

1 product

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Squid Cache Squid	Before 4.15
Squid Cache Squid	From 5.0 to 5.0.6

Configuration B

2 vulnerable

Vulnerable Software	Affected Versions
Debian Debian Linux	Version 10.0
Debian Debian Linux	Version 9.0

Configuration C

2 vulnerable

Vulnerable Software	Affected Versions
Fedoraproject Fedora	Version 33
Fedoraproject Fedora	Version 34

Configuration D

1 vulnerable

Vulnerable Software	Affected Versions
Netapp Cloud Manager	All versions

Related CWEs

CWE-116

Improper Encoding or Escaping of Output

The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

References (18)

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

Source: cve@mitre.org

Mailing ListThird Party Advisory

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

Source: cve@mitre.org

Mailing ListThird Party Advisory

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

Source: cve@mitre.org

PatchVendor Advisory

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

Source: cve@mitre.org

PatchThird Party Advisory

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

Source: cve@mitre.org

Mailing ListThird Party Advisory

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

Source: cve@mitre.org

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

Source: cve@mitre.org

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

Source: cve@mitre.org

Third Party Advisory

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

Source: cve@mitre.org

Third Party Advisory

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