CVE-2023-23934

Aliases:GHSA-px8h-6qxv-m22qPYSEC-2023-57
Advisory lineage Upstream: 0 Downstream: 8
Modified
Published: 14 Feb 2023, 19:56
Last modified:10 Mar 2025, 21:11

Vulnerability Summary

Overall Risk (default)
low
14/100
CVSS Score
3.5 LOW
v3.1 (nvd)
EPSS Score
0.27% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

14 Feb 2023, 19:56
Published
Vulnerability first disclosed
10 Mar 2025, 21:11
Last Modified
Vulnerability information updated

Description

Werkzeug is a comprehensive WSGI web application library. Browsers may allow "nameless" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug prior to 2.2.3 will parse the cookie `=__Host-test=bad` as __Host-test=bad`. If a Werkzeug application is running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser, the Werkzeug application will see the bad cookie value but the valid cookie key. The issue is fixed in Werkzeug 2.2.3.

CVSS Metrics

  • v3.1•LOW•Score: 2.6CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
  • v3.1•LOW•Score: 3.5CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS Trends

Current EPSS score: 0.27%• Percentile: 50%

Techniques & Countermeasures

  • CWE-20•Improper Input Validation

    The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Affected Systems

  • pallets•werkzeug

    < 2.2.3

  • palletsprojects•werkzeug

    < 2.2.3

  • PyPI•werkzeug

    < cf275f42acad1b5950c50ffe8ef58fe62cdce028 | < 2.2.3

References (9)