CVE-2019-12527

Name: CVE-2019-12527
Creator: NVD / NIST
Published: 2019-07-11T19:15:13.097+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 50.45%

Last modified Jun 17, 2026

CVE-2019-12527 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic Authentication with HttpHeader::getAuth, Squid uses a global buffer to store the decoded data. EPSS estimates a 50.45% chance of exploitation in the next 30 days.

Description

An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic Authentication with HttpHeader::getAuth, Squid uses a global buffer to store the decoded data. Squid does not check that the decoded length isn't greater than the buffer, leading to a heap-based buffer overflow with user controlled data.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

50.45%

98.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Squid-Cache	Squid	>= 4.0.23, <= 4.7
Fedoraproject	Fedora	29
Debian	Debian Linux	10.0
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.04
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux Eus	8.1
Redhat	Enterprise Linux Eus	8.2
Redhat	Enterprise Linux Eus	8.4
Redhat	Enterprise Linux Eus	8.6
Redhat	Enterprise Linux Server Aus	8.2
Redhat	Enterprise Linux Server Aus	8.4
Redhat	Enterprise Linux Server Aus	8.6
Redhat	Enterprise Linux Server Tus	8.2
Redhat	Enterprise Linux Server Tus	8.4
Redhat	Enterprise Linux Server Tus	8.6

References

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlBroken Link
http://www.securityfocus.com/bid/109143Broken Link, Third Party Advisory, VDB Entry
http://www.squid-cache.org/Versions/v4/changesets/Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patchPatch, Vendor Advisory
https://access.redhat.com/errata/RHSA-2019:2593Third Party Advisory
https://github.com/squid-cache/squid/commits/v4Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/
https://seclists.org/bugtraq/2019/Aug/42Mailing List, Third Party Advisory
https://usn.ubuntu.com/4065-1/Third Party Advisory
https://www.debian.org/security/2019/dsa-4507Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlBroken Link
http://www.securityfocus.com/bid/109143Broken Link, Third Party Advisory, VDB Entry
http://www.squid-cache.org/Versions/v4/changesets/Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patchPatch, Vendor Advisory
https://access.redhat.com/errata/RHSA-2019:2593Third Party Advisory
https://github.com/squid-cache/squid/commits/v4Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/
https://seclists.org/bugtraq/2019/Aug/42Mailing List, Third Party Advisory
https://usn.ubuntu.com/4065-1/Third Party Advisory
https://www.debian.org/security/2019/dsa-4507Third Party Advisory

Timeline

Published: Jul 11, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-12527?

How severe is CVE-2019-12527?

CVE-2019-12527 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 50.45% probability of exploitation in the next 30 days.

How do I fix CVE-2019-12527?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-12527?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST