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CVE-2025-5025

MediumPublished

No QUIC certificate pinning with wolfSSL

Published: May 28, 2025
Updated: May 30, 2025
Assigning CNA: curl
Evidence observed: Aug 28, 2026

Primary CVSS

4.8/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 22.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

cve-2025-5025PoC
Proof-of-concept exploit for CVE-2025-5025, demonstrating the vulnerability with a Docker-based environment for testing and validation.

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