CVE catalog
CVE-2021-28662
squid: CVE-2021-28662
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 71.76% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | squid | sid | 7.7-1 | fixed |
| Debian | squid | forky | 7.7-1 | fixed |
| Debian | squid | trixie | 6.13-2+deb13u3 | fixed |
| Debian | squid | trixie-security | 6.13-2+deb13u2 | fixed |
| Debian | squid | bookworm | 5.7-2+deb12u5 | fixed |
| Debian | squid | bookworm-security | 5.7-2+deb12u6 | fixed |
| Alpine | squid | 3.10 | 4.15-r0 | fixed |
| Alpine | squid | 3.11 | 4.15-r0 | fixed |
| Alpine | squid | 3.12 | 4.15-r0 | fixed |
| Alpine | squid | 3.13 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.14 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.15 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.16 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.17 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.18 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.19 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.20 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.21 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.22 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.23 | 5.0.6-r0 | fixed |
| Alpine | squid | 3.24 | 5.0.6-r0 | fixed |
| Ubuntu | squid | 20.04 | 4.8-1ubuntu2 | vulnerable |
| Ubuntu | squid | 20.04 | 4.8-1ubuntu3 | vulnerable |
| Ubuntu | squid | 20.04 | 4.9-2ubuntu1 | vulnerable |
| Ubuntu | squid | 20.04 | 4.9-2ubuntu2 | vulnerable |
| Ubuntu | squid | 20.04 | 4.9-2ubuntu3 | vulnerable |
| Ubuntu | squid | 20.04 | 4.9-2ubuntu4 | vulnerable |
| Ubuntu | squid | 20.04 | 4.10-1ubuntu1 | vulnerable |
| Ubuntu | squid | 20.04 | 4.10-1ubuntu1.1 | vulnerable |
| Ubuntu | squid | 20.04 | 4.10-1ubuntu1.2 | vulnerable |
| Ubuntu | squid | 20.04 | 4.10-1ubuntu1.3 | vulnerable |
| Ubuntu | squid | 20.04 | 4.10-1ubuntu1.4 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | squid | source | sid | 4.13-10 | not yet assigned | Not reported | [988891] |
| Debian | squid | source | forky | 4.13-10 | not yet assigned | Not reported | [988891] |
| Debian | squid | source | trixie | 4.13-10 | not yet assigned | Not reported | [988891] |
| Debian | squid | source | bookworm | 4.13-10 | not yet assigned | Not reported | [988891] |
| Alpine | squid | apk | 3.10 | 4.15-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.11 | 4.15-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.12 | 4.15-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.13 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.14 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.15 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.16 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.17 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.18 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.19 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.20 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.21 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.22 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.23 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Alpine | squid | apk | 3.24 | 5.0.6-r0 | Not reported | ALPINE-CVE-2021-28662 | Not reported |
| Ubuntu | squid | deb | 20.04 | 4.10-1ubuntu1.4 | Not reported | UBUNTU-CVE-2021-28662 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [squid]Unknown
Details (4)
5.7-2+deb12u5· amd64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squid-cgi]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squidclient]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squid-common]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· all · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· all · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· all · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· all · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squid-openssl]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squid-purge]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.13-10dsa · squid · debian · bookworm; dsa · squid · debian · 12
[Debian 13 (Trixie)]
- [squid]Unknown
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
- [squid-cgi]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
- [squidclient]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
- [squid-common]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· all · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· all · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· all · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· all · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
- [squid-openssl]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
- [squid-purge]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.13-10dsa · squid · debian · 13
Observed:
References
- [https://access.redhat.com/errata/RHSA-2021:4292]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2021_4292.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2021-28662]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-28662]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-28662]
- [https://security-tracker.debian.org/tracker/CVE-2021-28662]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2022-0672.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]