Vulnerability record · CVE-2020-14059 · published 30 June 2020

CVE-2020-14059: Squid-cache squid vulnerability

Squid Cache · Squid

An issue was discovered in Squid 5.x before 5.0.3. Due to an Incorrect Synchronization, a Denial of Service can occur when processing objects in an SMP cache because of an Ipc::Mem::PageStack::pop ABA problem during access to the memory page/slot management list.

6.5 CVSS 3.1 Medium EPSS 4.4% · top 9.0% CWE-662 · CWE-662

6.5CVSS 3.1 base score, v2 4.0

4.4%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References

17 Jun 2026Last modified by NVD

Description

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

Affected products

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

Squid Squid Cache

References

Link	Tags
http://www.squid-cache.org/Advisories/SQUID-2020_5.txt	Vendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/squid-5-7a5af8db8e0377c06ed9ffbdcb1334389c7cd8ab.patch	PatchVendor Advisory
https://security.netapp.com/advisory/ntap-20210312-0001/	Third Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2020_5.txt	Vendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/squid-5-7a5af8db8e0377c06ed9ffbdcb1334389c7cd8ab.patch	PatchVendor Advisory
https://security.netapp.com/advisory/ntap-20210312-0001/	Third Party Advisory

Track CVE-2020-14059 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-54574Squid-cache squid heap-based buffer overflow vulnerabilitySquid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow and possible remote code execution att…EPSS 24%1 Aug 2025 9.8CVE-2020-11945Squid-cache squid integer overflow vulnerabilityAn issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that ar…EPSS 27%23 Apr 2020 9.8CVE-2019-12519Squid-cache squid out-of-bounds write vulnerabilityAn issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function …EPSS 6.7%15 Apr 2020 9.8CVE-2019-12524Squid-cache squid missing authentication for critical function vulnerabilityAn issue was discovered in Squid through 4.7. When handling requests from users, Squid checks its rules to see if the request should be denied. Squid…EPSS 3.9%15 Apr 2020 9.8CVE-2019-12526Squid-cache squid out-of-bounds write vulnerabilityAn issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a rem…EPSS 20%26 Nov 2019 9.8CVE-2019-12525Squid-cache squid out-of-bounds write vulnerabilityAn issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the heade…EPSS 24%11 Jul 2019 9.2CVE-2026-33526Squid-cache squid use after free vulnerabilitySquid is a caching proxy for the Web. Prior to version 7.5, due to heap Use-After-Free, Squid is vulnerable to Denial of Service when handling ICP tr…EPSS 13%26 Mar 2026 9.1CVE-2019-12523Squid-cache squid vulnerabilityAn issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP request is made. This HTTP request doesn't go through …EPSS 4.3%26 Nov 2019

Source: NIST National Vulnerability Database (record CVE-2020-14059), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.