VDB-243714 · CVE-2023-46847 · RHSA-2023:6266

Squid Web Proxy up to 5.9/6.3 HTTP Digest Authentication heap-based overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.7	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Squid Web Proxy up to 5.9/6.3. This impacts an unknown function of the component HTTP Digest Authentication Handler. The manipulation results in heap-based overflow. This vulnerability is cataloged as CVE-2023-46847. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Squid Web Proxy up to 5.9/6.3 (Firewall Software). Affected is some unknown functionality of the component HTTP Digest Authentication Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest Authentication.

The weakness was shared 10/27/2023. The advisory is available at github.com. This vulnerability is traded as CVE-2023-46847 since 10/27/2023. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 236673 (Alibaba Cloud Linux 3 : 0135: squid:4 (ALINUX3-SA-2023:0135)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.4 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at squid-cache.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (236673) and EUVD (EUVD-2023-51013). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Firewall Software

Name

Squid Web Proxy

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.7

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 8.6
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 236673
Nessus Name: Alibaba Cloud Linux 3 : 0135: squid:4 (ALINUX3-SA-2023:0135)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Squid Web Proxy 6.4
Patch: squid-cache.org

Timelineinfo

10/27/2023 🔍
10/27/2023 +0 days 🔍
10/27/2023 +0 days 🔍
08/07/2026 +1015 days 🔍

Sourcesinfo

Advisory: RHSA-2023:6266
Status: Confirmed

CVE: CVE-2023-46847 (🔍)
GCVE (CVE): GCVE-0-2023-46847
GCVE (VulDB): GCVE-100-243714
EUVD: 🔍

Entryinfo

Created: 10/27/2023 12:31
Updated: 08/07/2026 05:02
Changes: 10/27/2023 12:31 (40), 11/19/2023 08:50 (2), 11/19/2023 08:52 (21), 09/16/2024 18:50 (20), 05/18/2025 17:59 (2), 08/07/2026 04:26 (2), 08/07/2026 05:02 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.