What’s Vulnerable › Vulnerabilities
CVE-2019-12519
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 6.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-04-15 · updated 2026-06-17
- Weakness: CWE-787
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.
Affected products
- Canonical Ubuntu Linux: 16.04, 18.04, 19.10, 20.04
- Debian Linux: 9.0, 10.0
- openSUSE Leap: 15.1
- Squid: from 3.0 through 3.5.28; from 4.0 through 4.10; from 5.0 through 5.0.1
References
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
- http://www.openwall.com/lists/oss-security/2020/04/23/1
- https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.txt
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
- https://security.gentoo.org/glsa/202005-05
- https://security.netapp.com/advisory/ntap-20210205-0006/
- https://usn.ubuntu.com/4356-1/
- https://www.debian.org/security/2020/dsa-4682
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
- http://www.openwall.com/lists/oss-security/2020/04/23/1
- https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.txt
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
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