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CVE

CVE-2021-28662

An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain response heade

An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in benign network traffic.

MEDIUM · CVSS 6.5 EPSS 0.1363
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 6% of all CVEs by exploitation likelihood
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-116Improper Encoding or Escaping of Output
▤

Affected Products & Versions

4
squid-cache squid>= 4.0.1 and < 4.15
squid-cache squid>= 5.0 and < 5.0.6
debian linuxall versions
fedoraproject fedoraall versions
▣

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 · 12:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

7
suse-csafopenSUSE-SU-2024:11403-1
suse-csafopenSUSE-SU-2021:1961-1
suse-csafopenSUSE-SU-2021:0879-1
suse-csafSUSE-SU-2021:1961-1
usnUSN-4981-1
🔗

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
http://www.squid-cache.org/Versions/v6/changesets/squid-6-051824924c709bd6162a378f746fb859454c674e.patchPatchVendor Advisory
https://github.com/squid-cache/squid/commit/051824924c709bd6162a378f746fb859454c674ePatchThird Party Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-jjq6-mh2h-g39hPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
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