CVE-2026-103415
CVE-2026-103415
This page contains facts from public vulnerability sources. Check the original advisory before updating.
When a TLS 1.3 client processes a HelloRetryRequest, it copies the server's cookie into its second ClientHello without checking that the cookie fits in the outgoing packet. Both the length and the contents of that cookie come from the peer, and the write happens before certificate authentication completes, so a malicious or compromised server can overwrite memory past the caller supplied TLS packet buffer without presenting a certificate. Only the client path is affected.
CVSS 9.3 · Critical · EPSS 0.3% · Fix available
- Published
- Updated
Affected products and versions
netx duo
- Versions
- ≥ 0, ≤ 6.5.1.202602: Affected (custom)
- 6.5.2.202603: Not affected
Update to 6.5.2.202603