CVE-2023-49288— Denial of Service in HTTP Collapsed Forwarding in Squid
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
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 |
|---|
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- https://github.com/squid-cache/squid/security/advisories/GHSA-rj5h-46j6-q2g5x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2023-49288
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
- CVE-2026-33526
Squid vulnerable to Denial of Service in ICP Request handlin - CVE-2026-33515
Squid has issues in ICP message handling - CVE-2026-32748
Squid has Denial of Service in ICP Response handling - CVE-2025-62168
Squid vulnerable to information disclosure via authenticatio - CVE-2025-54574
Squid's URN Handling can lead to Buffer Overflow
Same vendor: squid-cache
- CVE-2026-33526
Squid vulnerable to Denial of Service in ICP Request handlin - CVE-2026-33515
Squid has issues in ICP message handling - CVE-2026-32748
Squid has Denial of Service in ICP Response handling - CVE-2025-62168
Squid vulnerable to information disclosure via authenticatio - CVE-2025-54574
Squid's URN Handling can lead to Buffer Overflow
V. Comments for CVE-2023-49288
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