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Vulnerability record · CVE-2020-8449 · published 4 February 2020

CVE-2020-8449: Squid-cache squid exposure of resource to wrong sphere vulnerability

Squid Cache · Squid

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.

7.5 CVSS 3.1 High EPSS 8.3% · top 5.3% CWE-668 · Exposure of resource to wrong sphere
7.5CVSS 3.1 base score, v2 5.0
8.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
30References
17 Jun 2026Last modified by NVD

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.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.html Mailing ListThird Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2020_1.txt PatchVendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2020_1.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-8e657e835965c3a011375feaa0359921c5b3e2dd.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_1.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-b3a0719affab099c684f1cd62b79ab02816fa962.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-d8e4715992d0e530871519549add5519cbac0598.patch PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G6W2IQ7QV2OGREFFUBNVZID
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TSU6SPANL27AGK5PCGBJOKG
https://security.gentoo.org/glsa/202003-34 Third 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-4682 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.html Mailing ListThird Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2020_1.txt PatchVendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2020_1.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-8e657e835965c3a011375feaa0359921c5b3e2dd.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_1.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-b3a0719affab099c684f1cd62b79ab02816fa962.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-d8e4715992d0e530871519549add5519cbac0598.patch PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G6W2IQ7QV2OGREFFUBNVZID
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TSU6SPANL27AGK5PCGBJOKG
https://security.gentoo.org/glsa/202003-34 Third 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-4682 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-8449), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.