Description
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service attack against Squid's Gopher gateway. The gopher protocol is always available and enabled in Squid prior to Squid 6.0.1. Responses triggering this bug are possible to be received from any gopher server, even those without malicious intent. Gopher support has been removed in Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should reject all gopher URL requests.
References (6)
Core 6
Core References
Vendor Advisory
https://security.netapp.com/advisory/ntap-20231214-0006/
Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/
Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/
Vendor Advisory x_refsource_confirm
https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f
Scores
CVSS v3
7.5
EPSS
0.0226
EPSS Percentile
84.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-476
Status
published
Products (1)
squid-cache/squid
< 6.0.1
Published
Nov 06, 2023
Tracked Since
Feb 18, 2026