PT-2026-3445 · Quicly · Quicly

Published 2026-01-19 · Updated 2026-02-27 · CVE-2025-61684

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Quicly versions prior to commit d9d3df6a8530a102b57d840e39b0311ce5c9e14e

Description Quicly, an implementation of the IETF QUIC protocol, is affected by a denial-of-service issue. A remote attacker can trigger an assertion failure, leading to a process crash. The issue is exploitable without authentication.

Recommendations Update Quicly to commit d9d3df6a8530a102b57d840e39b0311ce5c9e14e or a later version.

Exploit

Fix

DoS

RCE

Assertion Failure

Weakness Enumeration

CWE-20

CWE-617

Related Identifiers

CVE-2025-61684

GHSA-WR3C-345M-43V9

Affected Products

Quicly

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/61xxx/CVE-2025-61684.json · Exploit
• https://github.com/h2o/quicly/commit/d9d3df6a8530a102b57d840e39b0311ce5c9e14e · Patch
• https://github.com/h2o/quicly/security/advisories/GHSA-wr3c-345m-43v9 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-61684 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-61684 · Security Note
• https://t.me/cveNotify/153575 · Telegram Post
• https://twitter.com/CVEnew/status/2013277741869625789 · Twitter Post