CVE-2020-8449

Name: CVE-2020-8449
Creator: NVD / NIST
Published: 2020-02-04T20:15:14.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 8.31%

Last modified Jun 17, 2026

CVE-2020-8449 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.. EPSS estimates a 8.31% chance of exploitation in the next 30 days.

Description

An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

8.31%

94.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-668

Affected Software

Vendor	Product	Versions
Squid-Cache	Squid	< 4.10
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.10
Opensuse	Leap	15.1
Fedoraproject	Fedora	30
Fedoraproject	Fedora	31

References

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.htmlMailing List, Third Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2020_1.txtPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2020_1.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-8e657e835965c3a011375feaa0359921c5b3e2dd.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_1.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-b3a0719affab099c684f1cd62b79ab02816fa962.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-d8e4715992d0e530871519549add5519cbac0598.patchPatch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G6W2IQ7QV2OGREFFUBNVZIDD3RJBDE4R/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TSU6SPANL27AGK5PCGBJOKG4LUWA555J/
https://security.gentoo.org/glsa/202003-34Third Party Advisory
https://security.netapp.com/advisory/ntap-20210304-0002/Third Party Advisory
https://usn.ubuntu.com/4289-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4682Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.htmlMailing List, Third Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2020_1.txtPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2020_1.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-8e657e835965c3a011375feaa0359921c5b3e2dd.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_1.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-b3a0719affab099c684f1cd62b79ab02816fa962.patchPatch, Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-d8e4715992d0e530871519549add5519cbac0598.patchPatch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G6W2IQ7QV2OGREFFUBNVZIDD3RJBDE4R/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TSU6SPANL27AGK5PCGBJOKG4LUWA555J/
https://security.gentoo.org/glsa/202003-34Third Party Advisory
https://security.netapp.com/advisory/ntap-20210304-0002/Third Party Advisory
https://usn.ubuntu.com/4289-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4682Third Party Advisory

Timeline

Published: Feb 4, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8449?

How severe is CVE-2020-8449?

CVE-2020-8449 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 8.31% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8449?

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-2020-8449?

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

Scan your code now

Source: NVD / NIST