CVE-2021-31808

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 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.

Affected (7)

Products: Squid Cache: Squid · Debian: Debian Linux · Netapp: Cloud Manager · +1 more

Show all products

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

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

1 vulnerable

Vulnerable Software	Affected Versions
Netapp Cloud Manager	All versions

Configuration D

2 vulnerable

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

Related CWEs

CWE-190

Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

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

ExploitPatchVendor 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