CVE-2023-49288CWE-416

Denial of Service in HTTP Collapsed Forwarding in Squid

High · published December 4, 2023

CVSS v3.1
8.6
EPSS
5%
Percentile
91.9
In the wild
Unconfirmed
What it is

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Affected versions of squid are subject to a a Use-After-Free bug which can lead to a Denial of Service attack via collapsed forwarding. All versions of Squid from 3.5 up to and including 5.9 configured with "collapsed_forwarding on" are vulnerable. Configurations with "collapsed_forwarding off" or without a "collapsed_forwarding" directive are not vulnerable. This bug is fixed by Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should remove all collapsed_forwarding lines from their squid.conf.

The record
Technical detail
CVSS v3.1
8.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.04777 · 91.9th percentile
Weakness
CWE-416 · Use After Free
Published
2023-12-04T22:49Z
EPSS history
Timeline
  • 04 DEC 22:49Z
    Denial of Service in HTTP Collapsed Forwarding in Squid
    cvelistv5