CVE-2020-25097

Name: CVE-2020-25097
Creator: NVD / NIST
Published: 2021-03-19T05:15:12.48+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 8.16%

Last modified Jun 17, 2026

CVE-2020-25097 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. An issue was discovered in Squid through 4.13 and 5.x through 5.0.4. Due to improper input validation, it allows a trusted client to perform HTTP Request Smuggling and access services otherwise forbidden by the security controls. EPSS estimates a 8.16% chance of exploitation in the next 30 days.

Description

An issue was discovered in Squid through 4.13 and 5.x through 5.0.4. Due to improper input validation, it allows a trusted client to perform HTTP Request Smuggling and access services otherwise forbidden by the security controls. This occurs for certain uri_whitespace configuration settings.

Metrics

CVSS 3.1

8.6/10

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

EPSS Probability

8.16%

94.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Squid-Cache	Squid	>= 2.0, < 4.14
Squid-Cache	Squid	>= 5.0.1, < 5.0.5
Debian	Debian Linux	10.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34
Netapp	Cloud Manager	All versions

References

http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_11.patchMailing List, Patch, Vendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/SQUID-2020_11.patchMailing List, Patch, Vendor Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-jvf6-h9gj-pmj6Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJMDRVV677AJL4BZAOLCT5LMFCGBZTC2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FBXFWKIGXPERDVQXG556LLPUOCMQGERC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O3RYBDMJCPYGOSURWDR3WJTE474UFT77/
https://security.gentoo.org/glsa/202105-14Third Party Advisory
https://security.netapp.com/advisory/ntap-20210727-0010/Third Party Advisory
https://www.debian.org/security/2021/dsa-4873Third Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_11.patchMailing List, Patch, Vendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/SQUID-2020_11.patchMailing List, Patch, Vendor Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-jvf6-h9gj-pmj6Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJMDRVV677AJL4BZAOLCT5LMFCGBZTC2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FBXFWKIGXPERDVQXG556LLPUOCMQGERC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O3RYBDMJCPYGOSURWDR3WJTE474UFT77/
https://security.gentoo.org/glsa/202105-14Third Party Advisory
https://security.netapp.com/advisory/ntap-20210727-0010/Third Party Advisory
https://www.debian.org/security/2021/dsa-4873Third Party Advisory

Timeline

Published: Mar 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25097?

How severe is CVE-2020-25097?

CVE-2020-25097 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 8.16% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25097?

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-2020-25097?

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

Scan your code now

Source: NVD / NIST