CVE-2025-6338 is a critical incomplete cleanup vulnerability in Qt Network's Schannel support on Windows, affecting Qt versions 5.15.0 through 6.8.3, and 6.9.0 before 6.9.2. This flaw can lead to a Denial of Service over an extended period. With a CVSS score of 9.2 (CRITICAL), it presents a severe risk due to its network-based attack vector and low attack complexity, allowing unauthenticated attackers to cause high availability impact. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion, suggesting it is not widely known or exploited in the wild.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
| The Qt Company | Qt | >= 6.9.0, < 6.9.2, >= 5.15.0, <= 6.8.3CNA affecteddefault unaffected |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.