CVE-2021-31808: An issue was discovered in Squid before 4.15 and 5.x before 5.0.6

Medium severity · published May 27, 2021

CVE-2021-31808

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6

6.5

CVSS

5.3%

EPSS

On KEV

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.

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)5.3% · higher than 93% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Cloud Manager · Netapp

All versions, or not specified · source: NVD

Debian Linux · Debian

9.0; 10.0 · source: NVD

Fedora · Fedoraproject

33; 34 · source: NVD

Squid · Squid-cache

before 4.15; 5.0 before 5.0.6 · source: NVD

Affected product

Debian Linux

Debian

All Debian Linux CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-31808

CVE.org

https://www.cve.org/CVERecord?id=CVE-2021-31808

Mailing List

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

Mailing List

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

Exploit

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

Patch

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

Mailing List

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

lists.fedoraproject.org

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