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CVE-2023-49288— Denial of Service in HTTP Collapsed Forwarding in Squid

Quick assessment

Affected
squid-cache squid
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Squid是一套代理服务器和Web缓存服务器软件。该软件提供缓存万维网、过滤流量、代理上网等功能。 Squid 6.0.1之前版本存在资源管理错误漏洞，该漏洞源于存在释放后重用错误，可能会通过崩溃转发导致拒绝服务攻击。

CVSS 8.6 · High EPSS 4.78% · P92

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-49288

Vulnerability Information
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Vulnerability Title
Denial of Service in HTTP Collapsed Forwarding in Squid
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Squid 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Squid是一套代理服务器和Web缓存服务器软件。该软件提供缓存万维网、过滤流量、代理上网等功能。 Squid 6.0.1之前版本存在资源管理错误漏洞，该漏洞源于存在释放后重用错误，可能会通过崩溃转发导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
squid-cache squid >= 3.5, < 6.0.1 -

II. Public POCs for CVE-2023-49288

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8265 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2023-49288

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Vendor Advisories for CVE-2023-49288 (2)

Mailing List Discussions for CVE-2023-49288 (2)

Same Patch Batch · squid-cache · 2023-12-04 · 3 CVEs total

CVE-2023-49285 8.6 HIGH Denial of Service in HTTP Message Processing in Squid
CVE-2023-49286 8.6 HIGH Denial of Service in Helper Process management

IV. Related Vulnerabilities

Same product: squid
Same vendor: squid-cache
Same weakness: CWE-416

V. Comments for CVE-2023-49288

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