CVE-2025-5025

low-risk

Published 2025-05-28

libcurl supports *pinning* of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC and HTTP/3. Since pinning makes the transfer succeed if the pin is fine, users could unwittingly connect to an impostor server without noticing.

Do I need to act?

0.06% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 4.8/10 Medium

NETWORK / HIGH complexity

Affected Products (1)

Curl

Affected Vendors

Haxx

References (4)

Vendor Advisory https://curl.se/docs/CVE-2025-5025.html

Vendor Advisory https://curl.se/docs/CVE-2025-5025.json

Exploit https://hackerone.com/reports/3153497

Mailing List http://www.openwall.com/lists/oss-security/2025/05/28/5

/ 100

low-risk

Severity 15/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal