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CVE-2019-12519

9.8 · CRITICAL

An issue was discovered in Squid through 4.7.

Published Apr 15, 2020CWE-787EPSS 6.72%

Overview

CVE-2019-12519 is a critical-severity vulnerability. It was published on April 15, 2020 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When adding a new member, there is no check to ensure that the stack won't overflow.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2020-05/msg00018.htmlRefwww.openwall.com/lists/oss-security/2020/04/23/1Refgitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.txtReflists.debian.org/debian-lts-announce/2020/07/msg00009.htmlRefsecurity.gentoo.org/glsa/202005-05Refsecurity.netapp.com/advisory/ntap-20210205-0006/Refusn.ubuntu.com/4356-1/Refwww.debian.org/security/2020/dsa-4682Reflists.opensuse.org/opensuse-security-announce/2020-05/msg00018.htmlRefwww.openwall.com/lists/oss-security/2020/04/23/1

How CyberStrike helps

Frequently asked questions

What is CVE-2019-12519?

CVE-2019-12519 is a critical-severity vulnerability. It was published on April 15, 2020 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2019-12519?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-12519?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-12519?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-12519 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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