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No exploitation reportedFix available

CVE-2020-14058

No exploitation reported by the sources we read.

  • Published2020-06-30
  • Fixed in5.0.3 · 4.12

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in Squid before 4.12 and 5.x before 5.0.3. Due to use of a potentially dangerous function, Squid and the default certificate validation helper are vulnerable to a Denial of Service when opening a TLS connection to an attacker-controlled server for HTTPS. This occurs because unrecognized error values are mapped to NULL, but later code expects that each error value is mapped to a valid error string.

Timeline

dates in UTC
  1. 2020-06-3019:15CVE publishedNVD

Versions per branch

NVD
Squid-cache squid
BranchAffectedFixed in
5.0≥ 5.0, < 5.0.35.0.3
4.x≥ 4.0, < 4.124.12
3.x≥ 3.1, ≤ 3.5.28no fix published
Fedoraproject fedora
BranchAffectedFixed in
31.x= 31no fix published
Netapp cloud manager
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libecapRocky Linux:8all versions · fixed in 0:1.0.1-2.module+el8.4.0+404+316a0dc5
  • libecapRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:1.0.1-2.module+el8.1.0+4044+36416a77and 3 other packages
  • libecapAlmaLinux:8all versions · fixed in 1.0.1-2.module_el8.6.0+2741+01592ae8and 1 other package
  • squidTuxCare:OracleLinux:6all versions · fixed in 7:3.1.23-30.el6.cloudlinux.els
  • squidTuxCare:Debian:10all versions · fixed in 4.6-1+deb10u10+tuxcare.els1and 5 other packages
  • squidTuxCare:CentOS:6all versions · fixed in 7:3.1.23-30.el6.cloudlinux.els
  • squidRed Hat:enterprise_linux:8::appstreamall versions · fixed in 7:4.11-3.module+el8.3.0+7851+7808b5f9and 2 other packages
  • squidopenEuler:20.03-LTS-SP1all versions · fixed in 4.9-6.oe1

6 more package ranges on OSV.dev

Vendor advisories

  • RHSA-2020:4743 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: squid:4 security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Update Squid-cache squid to 5.0.3 · 4.12
  2. Vendor fix Red Hat Product Security RHSA-2020:4743 · 30 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • FIRST EPSSEPSS score2.5 %2026-11-09
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-06-30
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-14058?

An issue was discovered in Squid before 4.12 and 5.x before 5.0.3. Due to use of a potentially dangerous function, Squid and the default certificate validation helper are vulnerable to a Denial of Service when opening a TLS connection to an attacker-controlled server for HTTPS. This occurs because unrecognized error values are mapped to NULL, but later code expects that each error value is mapped to a valid error string.

Is CVE-2020-14058 actively exploited?

Active exploitation of CVE-2020-14058 has not been confirmed. Its EPSS score was 2.5% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-14058?

CVE-2020-14058 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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