CVE-2023-46728

HIGH EPSS 92.4%
Published Nov 6, 20232y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Nov 6, 2023 2y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
92.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 1

VendorProductVersionRange
squid-cachesquid* <6.0.1

References 6

  • github.com https://github.com/squid-cache/squid/commit/6ea12e8fb590ac6959e9356a81aa3370576568c3
    Patch
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f
    Vendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/
  • security.netapp.com https://security.netapp.com/advisory/ntap-20231214-0006/

Remediation

  • github.com https://github.com/squid-cache/squid/commit/6ea12e8fb590ac6959e9356a81aa3370576568c3
    Patch