CVE-2022-31015

Aliases:GHSA-f5x9-8jwc-25rwPYSEC-2022-205
Advisory lineage Upstream: 0 Downstream: 2
Modified
Published: 31 May 2022, 22:50
Last modified:22 Apr 2025, 17:55

Vulnerability Summary

Overall Risk (default)
medium
36/100
CVSS Score
6.5 MEDIUM
v3.1 (cve.org)
EPSS Score
0.48% LOW
0% probability +0.34%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

31 May 2022, 22:50
Published
Vulnerability first disclosed
22 Apr 2025, 17:55
Last Modified
Vulnerability information updated

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 Metrics

  • v4.0•HIGH•Score: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v2.0•MEDIUM•Score: 4.3AV:N/AC:M/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.48%• Percentile: 66%

Techniques & Countermeasures

  • CWE-248•Uncaught Exception

    An exception is thrown from a function, but it is not caught.

  • CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

    The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected Systems

  • agendaless•waitress

    ≥ 2.1.0, < 2.1.2

  • pylons•waitress

    ≥ 2.1.0, < 2.1.2

  • PyPI•waitress

    < 4f6789b035610e0552738cdc4b35ca809a592d48 | ≥ 2.1.0, < 2.1.2

References (7)