An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8.
Priority MEDIUM 61CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 1 fixed, 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-200.
Summary
An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating memory areas to target for remote code execution attacks.
Why it matters now
EPSS 0.40982 98th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 3 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 16
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* | 2.0 – 2.7; 3.0 – 3.5.28; 4.0 – 4.8 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:2.7:stable2:*:*:*:*:*:* | 2.7 stable2 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:2.7:stable3:*:*:*:*:*:* | 2.7 stable3 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:2.7:stable4:*:*:*:*:*:* | 2.7 stable4 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:2.7:stable5:*:*:*:*:*:* | 2.7 stable5 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:2.7:stable6:*:*:*:*:*:* | 2.7 stable6 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:2.7:stable7:*:*:*:*:*:* | 2.7 stable7 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:2.7:stable8:*:*:*:*:*:* | 2.7 stable8 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:2.7:stable9:*:*:*:*:*:* | 2.7 stable9 | Vulnerable | squid-cache |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
- cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* Versions 2.0 – 2.7; 3.0 – 3.5.28; 4.0 – 4.8 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:2.7:stable2:*:*:*:*:*:* Versions 2.7 stable2 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:2.7:stable3:*:*:*:*:*:* Versions 2.7 stable3 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:2.7:stable4:*:*:*:*:*:* Versions 2.7 stable4 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:2.7:stable5:*:*:*:*:*:* Versions 2.7 stable5 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:2.7:stable6:*:*:*:*:*:* Versions 2.7 stable6 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:2.7:stable7:*:*:*:*:*:* Versions 2.7 stable7 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:2.7:stable8:*:*:*:*:*:* Versions 2.7 stable8 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:2.7:stable9:*:*:*:*:*:* Versions 2.7 stable9 Vulnerable ·squid-cache
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
Show 6 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:* | 19.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* | 19.10 | Vulnerable | Canonical |
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* | 30 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | 31 | Vulnerable | Fedoraproject |
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:* Versions 19.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* Versions 19.10 Vulnerable ·Canonical
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* Versions 30 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
Remediation
Red Hat 1 advisory
- RHSA-2020:4743 Released 2020-11-04 · Red Hat rating Moderatesquid:4 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 8) libecap-1.0.1-2.module+el8.1.0+4044+36416a77.aarch64::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.ppc64le::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.s390x::squid:4 +11
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2020:4743 |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-18679
- 2026-10-03 Alias added: GHSA-4h4q-q4v8-2vq3
References
Advisory 8
Sources
- CVE-2019-18679 · CVE Program
- CVE-2019-18679 · NVD
- FIRST EPSS
- GHSA-4h4q-q4v8-2vq3 · GitHub Advisory Database · CC BY 4.0
- CVE-2019-18679 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences