What is CVE-2025-14017?

CVE-2025-14017 is a medium-severity vulnerability in Curl, classified under CWE-567 UNSYNCHRONIZED ACCESS TO SHARED DATA IN A MULTI-THREADED CONTEXT. CVSS score: 6.3/10. Published 2026-01-08.

How severe is CVE-2025-14017?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Curl

CVE-2025-14017

When doing multi-threaded LDAPS transfers (LDAP over TLS) with libcurl, changing TLS options in one thread would inadvertently change them globally and therefore possibly also affect other concurrently setup transfers. Disabling certificate verification for a specific transfer could unintentionally disable the feature for other threads as well.

EPSS: 0.001 (1.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Curl — versions 8.17.0, 8.16.0, 8.15.0
Haxx Curl

References

2499f714-1537-4658-8207-48ae4bb9eae9 (Vendor Advisory)
2499f714-1537-4658-8207-48ae4bb9eae9 (Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2025-14017?: CVE-2025-14017 is a medium-severity vulnerability in Curl, classified under CWE-567 UNSYNCHRONIZED ACCESS TO SHARED DATA IN A MULTI-THREADED CONTEXT. CVSS score: 6.3/10. Published 2026-01-08.
How severe is CVE-2025-14017?: Medium severity. CVSS v3 base score is 6.3 out of 10.