CVE catalog
CVE-2019-18677
squid: CVE-2019-18677
- Severity
- High · CVSS 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 7.24% · Oct 25, 2026
An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.
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 |
| Ubuntu | squid3 | 16.04 | 3.3.8-1ubuntu16 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.3.8-1ubuntu17 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu6 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7.1 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7.2 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7.3 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7.4 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7.5 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7.6 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7.7 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7.8 | vulnerable |
| Ubuntu | squid3 | 16.04 | 3.5.12-1ubuntu7.9 | fixed |
| Ubuntu | squid3 | 18.04 | 3.5.23-5ubuntu1 | vulnerable |
| Ubuntu | squid3 | 18.04 | 3.5.23-5ubuntu2 | vulnerable |
| Ubuntu | squid3 | 18.04 | 3.5.27-1ubuntu1 | vulnerable |
| Ubuntu | squid3 | 18.04 | 3.5.27-1ubuntu1.1 | vulnerable |
| Ubuntu | squid3 | 18.04 | 3.5.27-1ubuntu1.2 | vulnerable |
| Ubuntu | squid3 | 18.04 | 3.5.27-1ubuntu1.3 | vulnerable |
| Ubuntu | squid3 | 18.04 | 3.5.27-1ubuntu1.4 | fixed |
| Ubuntu | squid | 20.04 | 4.8-1ubuntu2 | vulnerable |
| Ubuntu | squid | 20.04 | 4.8-1ubuntu3 | vulnerable |
| Ubuntu | squid | 20.04 | 4.9-2ubuntu1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | squid | source | sid | 4.9-1 | not yet assigned | Not reported | Not reported |
| Debian | squid | source | forky | 4.9-1 | not yet assigned | Not reported | Not reported |
| Debian | squid | source | trixie | 4.9-1 | not yet assigned | Not reported | Not reported |
| Debian | squid | source | bookworm | 4.9-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | squid3 | deb | 16.04 | 3.5.12-1ubuntu7.9 | Not reported | UBUNTU-CVE-2019-18677 | Not reported |
| Ubuntu | squid3 | deb | 18.04 | 3.5.27-1ubuntu1.4 | Not reported | UBUNTU-CVE-2019-18677 | Not reported |
| Ubuntu | squid | deb | 20.04 | 4.9-2ubuntu1 | Not reported | UBUNTU-CVE-2019-18677 | 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:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squid-cgi]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squidclient]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squid-common]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· all · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· all · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· all · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· all · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squid-openssl]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
- [squid-purge]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
4.9-1dsa · squid · debian · bookworm; dsa · squid · debian · 12
[Debian 13 (Trixie)]
- [squid]Unknown
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
- [squid-cgi]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
- [squidclient]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
- [squid-common]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· all · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· all · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· all · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· all · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
- [squid-openssl]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
- [squid-purge]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
4.9-1dsa · squid · debian · 13
Observed:
References
- [https://access.redhat.com/errata/RHSA-2020:4743]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2020_4743.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2019-18677]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2019-18677]
- [https://security-tracker.debian.org/tracker/CVE-2019-18677]
- [https://wid.cert-bund.de/.well-known/csaf/white/2019/wid-sec-w-2022-1592.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]