CVE-2020-14058

Name: CVE-2020-14058
Creator: NVD / NIST
Published: 2020-06-30T19:15:11.13+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.61%

Last modified Jun 17, 2026

CVE-2020-14058 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 2.61% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.61%

83.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Squid-Cache	Squid	>= 3.1, <= 3.5.28
Squid-Cache	Squid	>= 4.0, < 4.12
Squid-Cache	Squid	>= 5.0, < 5.0.3
Fedoraproject	Fedora	31
Netapp	Cloud Manager	All versions

References

http://www.squid-cache.org/Advisories/SQUID-2020_6.txtVendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-93f5fda134a2a010b84ffedbe833d670e63ba4be.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/squid-5-c6d1a4f6a2cbebceebc8a3fcd8f539ceb7b7f723.patchPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3RG5FGSTCAYVIJPJHIY3MRZ7NFT6HDO7/
https://security.netapp.com/advisory/ntap-20210312-0001/Third Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2020_6.txtVendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-93f5fda134a2a010b84ffedbe833d670e63ba4be.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/squid-5-c6d1a4f6a2cbebceebc8a3fcd8f539ceb7b7f723.patchPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3RG5FGSTCAYVIJPJHIY3MRZ7NFT6HDO7/
https://security.netapp.com/advisory/ntap-20210312-0001/Third Party Advisory

Timeline

Published: Jun 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-14058?

How severe is CVE-2020-14058?

CVE-2020-14058 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.61% probability of exploitation in the next 30 days.

How do I fix CVE-2020-14058?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-14058?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST