CVE-2019-12519

CRITICAL
9.8
CVSS Score
Published: April 15, 2020 at 07:20 PM UTC
Updated: June 17, 2026 at 02:14 AM UTC
4 products affected across 4 vendorsDebian LinuxUbuntu LinuxLeap

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Severity
CRITICAL9.8
Exploit prediction
EPSS 7%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

3.0 ≤ v ≤ 3.5.284.0 ≤ v ≤ 4.105.0 ≤ v ≤ 5.0.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (8)

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
Mailing Listx_refsource_MLISTThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/04/23/1
Mailing Listx_refsource_MLISTThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
https://security.gentoo.org/glsa/202005-05
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
https://usn.ubuntu.com/4356-1/
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
https://www.debian.org/security/2020/dsa-4682

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

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