CVE-2023-23914: A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functionality fail when multiple URLs are requested serially. Using its HSTS support curl can be instructed to use HTTPS instead of usingan insecure clear-text HTTP step even when HTTP is provided in the URL. ThisHSTS mechanism would however surprisingly be ignored by subsequent transferswhen done on the same command line because the state would not be properlycarried on.
Overview
- Severity
- Critical (CVSS 9.1)
- CVSS Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2023-Feb
- Released
- 2023-02-24
- Last Updated
- 2026-02-18
- EPSS Score
- 0.86% (percentile: 54.7%)
FAQ
Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Affected Products (14)
Other
- 19668-17086
- 19686-17084
- 19671-17084
- 17941-16820
- 17950-16820
- 17951-16820
- 17952-16820
- 17944-16823
- 17958-16823
- 17955-16823
- 17877-16823
- 17878-17084
- 17879-17084
- 18295-17084
Revision History
- 2023-02-24: Information published.
- 2024-06-30: Information published.
- 2026-02-18: Information published.