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Vulnerability record · CVE-2020-8517 · published 4 February 2020

CVE-2020-8517: Squid-cache squid improper input validation vulnerability

Squid Cache · Squid

An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.

7.5 CVSS 3.1 High EPSS 6.8% · top 6.2% CWE-20 · Improper input validationCWE-787 · Out-of-bounds write
7.5CVSS 3.1 base score, v2 5.0
6.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.

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

Affected products

3 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://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html Mailing ListThird Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2020_3.txt Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-6982f1187a26557e582172965e266f544ea562a5.patch PatchVendor Advisory
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
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://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html Mailing ListThird Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2020_3.txt Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-6982f1187a26557e582172965e266f544ea562a5.patch PatchVendor Advisory
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

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Source: NIST National Vulnerability Database (record CVE-2020-8517), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.