CVE-2022-31015
MEDIUM
Published May 31, 20224y ago · Modified Jun 17, 20262w ago
5.9 CVSS 3.1
Published May 31, 2022 4y ago
Last Modified Jun 17, 2026 2w ago
Description
Waitress is a Web Server Gateway Interface server for Python 2 and 3. Waitress versions 2.1.0 and 2.1.1 may terminate early due to a thread closing a socket while the main thread is about to call select(). This will lead to the main thread raising an exception that is not handled and then causing the entire application to be killed. This issue has been fixed in Waitress 2.1.2 by no longer allowing the WSGI thread to close the socket. Instead, that is always delegated to the main thread. There is no work-around for this issue. However, users using waitress behind a reverse proxy server are less likely to have issues if the reverse proxy always reads the full response.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
No active exploitation signals — not in CISA KEV and no EPSS score yet.
Exploit & Patch Status
Public Exploit Known
Patch Available
Weaknesses 2
CWE-248
CWE-362
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| agendaless | waitress | * | ≥2.1.0 – <2.1.2 |
References 4
- github.com https://github.com/Pylons/waitress/commit/4f6789b035610e0552738cdc4b35ca809a592d48
- github.com https://github.com/Pylons/waitress/issues/374
- github.com https://github.com/Pylons/waitress/pull/377
- github.com https://github.com/Pylons/waitress/security/advisories/GHSA-f5x9-8jwc-25rw
Remediation
- github.com https://github.com/Pylons/waitress/commit/4f6789b035610e0552738cdc4b35ca809a592d48
- github.com https://github.com/Pylons/waitress/issues/374
- github.com https://github.com/Pylons/waitress/pull/377