CVE-2023-46728 SQUID-2021:8 Denial of Service in Gopher gateway
A NULL pointer dereference in Squid's Gopher gateway allows remote attackers to cause a denial of service via crafted responses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-46728?
CVE-2023-46728 is a high-severity vulnerability in Squid-Cache Squid, published on 6 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-476
Which versions are affected by CVE-2023-46728?
It affects 1 product.
Linux distribution packages (17)
squid SUSE:Enterprise Storage 7.1 | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise Module for Server Applications 15 SP4 | All versions | 5.7-150400.3.15.1 |
squid SUSE:Linux Enterprise Module for Server Applications 15 SP5 | All versions | 5.7-150400.3.15.1 |
squid SUSE:Linux Enterprise Server 12 SP5 | All versions | 4.17-4.33.1 |
squid SUSE:Linux Enterprise Server 15 SP1-LTSS | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise Server 15 SP2-LTSS | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise Server 15 SP3-LTSS | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 4.17-4.33.1 |
squid SUSE:Linux Enterprise Server for SAP Applications 15 SP1 | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise Server for SAP Applications 15 SP2 | All versions | 4.17-150000.5.41.1 |
squid SUSE:Linux Enterprise Server for SAP Applications 15 SP3 | All versions | 4.17-150000.5.41.1 |
squid openSUSE:Leap 15.4 | All versions | 5.7-150400.3.15.1 |
squid openSUSE:Leap 15.5 | All versions | 5.7-150400.3.15.1 |
Products include Squid-Cache Squid.
How do I fix CVE-2023-46728?
Upgrade to a fixed version.
Is CVE-2023-46728 being exploited?
There is no known exploitation of CVE-2023-46728 in the wild and no public exploit code.
Other vulnerabilities in Squid-Cache Squid
- CVE-2025-62168 Squid vulnerable to information disclosure via authentication credential leakage in error handling
- CVE-2025-54574 Squid's URN Handling can lead to Buffer Overflow
- CVE-2026-33526 Squid vulnerable to Denial of Service in ICP Request handling
- CVE-2026-32748 Squid has Denial of Service in ICP Response handling
- CVE-2023-50269 SQUID-2023:10 Denial of Service in HTTP Request parsing
Sources
Also known as AZL-31941, CLSA-2023-1702420408, CLSA-2023-1702420474, CLSA-2023-1702495324, CLSA-2023-1702495594, CLSA-2023-1702495796 and 9 more.