CVE-2024-49769

HIGH EPSS 68.8%
Published Oct 29, 20241y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Oct 29, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
68.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-772

Affected Products 1

VendorProductVersionRange
agendalesswaitress* <3.0.1

References 5

  • github.com https://github.com/Pylons/waitress/commit/1ae4e894c9f76543bee06584001583fc6fa8c95c
    Patch
  • github.com https://github.com/Pylons/waitress/issues/418
    Issue Tracking
  • github.com https://github.com/Pylons/waitress/pull/435
    Patch
  • github.com https://github.com/Pylons/waitress/security/advisories/GHSA-3f84-rpwh-47g6
    Vendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2024/11/msg00012.html

Remediation

  • github.com https://github.com/Pylons/waitress/commit/1ae4e894c9f76543bee06584001583fc6fa8c95c
    Patch
  • github.com https://github.com/Pylons/waitress/pull/435
    Patch