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Vulnerability record · CVE-2019-18679 · published 26 November 2019

CVE-2019-18679: Squid-cache squid information exposure vulnerability

Squid Cache · Squid

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.

7.5 CVSS 3.1 High EPSS 41% · top 1.4% CWE-200 · Information exposure
7.5CVSS 3.1 base score, v2 5.0
41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.squid-cache.org/Advisories/SQUID-2019_11.txt Third Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patch Release Notes
https://bugzilla.suse.com/show_bug.cgi?id=1156324 Issue TrackingThird Party Advisory
https://github.com/squid-cache/squid/pull/491 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/12/msg00011.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW5
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D
https://security.gentoo.org/glsa/202003-34
https://usn.ubuntu.com/4213-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4682
http://www.squid-cache.org/Advisories/SQUID-2019_11.txt Third Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patch Release Notes
https://bugzilla.suse.com/show_bug.cgi?id=1156324 Issue TrackingThird Party Advisory
https://github.com/squid-cache/squid/pull/491 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/12/msg00011.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW5
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D
https://security.gentoo.org/glsa/202003-34
https://usn.ubuntu.com/4213-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4682

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Source: NIST National Vulnerability Database (record CVE-2019-18679), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.