NULL pointer dereference in Squid-Cache Squid

CVE-2023-46728

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.060 (93.0th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2023-46728: held from 0.060 to 0.060.

EPSS over last 30 days · oldest: 0.060 · newest: 0.060 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2023-46728?
CVE-2023-46728 is a high-severity vulnerability in Squid-Cache Squid, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2023-11-06.
How severe is CVE-2023-46728?
High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-46728 known to be exploited?
3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.