Vulnerability in Haxx Curl
CVE-2023-23915
A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functionality to behave incorrectly when multiple URLs are requested in parallel. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. This HSTS mechanism would however surprisingly fail when multiple transfers are done in parallel as the HSTS cache file gets overwritten by the most recentlycompleted transfer. A later HTTP-only transfer to the earlier host name would then *not* get upgraded properly to HSTS.
EPSS: 0.009 (54.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- support@hackerone.com (Not Applicable)
- support@hackerone.com (Third Party Advisory)
- support@hackerone.com (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-23915?
- CVE-2023-23915 is a medium-severity vulnerability in Haxx Curl, classified under Cleartext Transmission of Sensitive Information. CVSS score: 6.5/10. Published 2023-02-23.
- How severe is CVE-2023-23915?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2023-23915 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.