What’s Vulnerable › Vulnerabilities

CVE-2023-46848: Squid: denial of service in ftp

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-03 · updated 2026-06-17
• Weakness: CWE-681

Description

Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs in HTTP Request messages or constructing ftp:// URLs from FTP Native input.

Affected products

• Red Hat Enterprise Linux: 9.0
• RedHat Enterprise Linux Eus: 9.2
• RedHat Enterprise Linux Server Aus: 9.2
• RedHat Enterprise Linux Server Tus: 9.2
• Squid: from 5.0.3 before 6.4 — fixed in 6.4

How to fix

Upgrade to a fixed version: Squid 6.4. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2023:6266
• https://access.redhat.com/errata/RHSA-2023:6268
• https://access.redhat.com/errata/RHSA-2023:6748
• https://access.redhat.com/security/cve/CVE-2023-46848
• https://bugzilla.redhat.com/show_bug.cgi?id=2245919
• https://github.com/squid-cache/squid/security/advisories/GHSA-2g3c-pg7q-g59w
• https://access.redhat.com/errata/RHSA-2023:6266
• https://access.redhat.com/errata/RHSA-2023:6268
• https://access.redhat.com/errata/RHSA-2023:6748
• https://access.redhat.com/security/cve/CVE-2023-46848
• https://bugzilla.redhat.com/show_bug.cgi?id=2245919
• https://github.com/squid-cache/squid/security/advisories/GHSA-2g3c-pg7q-g59w

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