Home/CVE/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
CVE

CVE-2021-31808

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

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.

MEDIUM · CVSS 6.5 EPSS 0.0033
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-190Integer Overflow or Wraparound
▤

Affected Products & Versions

5
squid-cache squid< 4.15
squid-cache squid>= 5.0 and < 5.0.6
debian linuxall versions
netapp cloud managerall versions
fedoraproject fedoraall versions
⚠

Public Exploits & PoCs

1
pocwww.squid-cache.org · squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patchwww.squid-cache.org
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 May 2021 · 02:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

2
usnUSN-4981-1
rhsaRHSA-2021:4292Moderate
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://seclists.org/fulldisclosure/2023/Oct/14Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/10/11/3Mailing ListThird Party Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xfPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00014.htmlMailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
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