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CVE-2024-49769— Waitress has a denial of service leading to high CPU usage/resource exhaustion

Quick assessment

Affected
Pylons waitress
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.

Waitress是Pylons项目的一个生产质量的纯 Python WSGI 服务器。 Waitress 3.0.1版本之前存在安全漏洞，该漏洞源于如果远程客户端在 waitress 调用 getpeername() 之前关闭连接，则 waitress 将无法正确清理连接，导致主线程尝试写入不再存在的套接字，但不会将其从尝试处理的套接字列表中删除。这会导致调用写入函数的忙循环。远程攻击者只需很少的资源就可以耗尽可用套接字中的 waitress。

CVSS 7.5 · High EPSS 1.38% · P71

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-49769

Vulnerability Information
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Vulnerability Title
Waitress has a denial of service leading to high CPU usage/resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
Waitress is a Web Server Gateway Interface server for Python 2 and 3. When a remote client closes the connection before waitress has had the opportunity to call getpeername() waitress won't correctly clean up the connection leading to the main thread attempting to write to a socket that no longer exists, but not removing it from the list of sockets to attempt to process. This leads to a busy-loop calling the write function. A remote attacker could run waitress out of available sockets with very little resources required. Waitress 3.0.1 contains fixes that remove the race condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Waitress 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Waitress是Pylons项目的一个生产质量的纯 Python WSGI 服务器。 Waitress 3.0.1版本之前存在安全漏洞，该漏洞源于如果远程客户端在 waitress 调用 getpeername() 之前关闭连接，则 waitress 将无法正确清理连接，导致主线程尝试写入不再存在的套接字，但不会将其从尝试处理的套接字列表中删除。这会导致调用写入函数的忙循环。远程攻击者只需很少的资源就可以耗尽可用套接字中的 waitress。
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
Pylons waitress < 3.0.1 -

II. Public POCs for CVE-2024-49769

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6143 chars
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III. Intelligence Information for CVE-2024-49769

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Patches & Fixes for CVE-2024-49769 (2)

Other References for CVE-2024-49769 (1)

IV. Related Vulnerabilities

Same product: waitress
Same vendor: Pylons
Same weakness: CWE-772

V. Comments for CVE-2024-49769

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