CVE-2026-106465
The NetX Secure DTLS server sends a HelloVerifyRequest carrying a freshly generated cookie, but…
- Risk score
- 62/100
- CVSS
- 8.7 v4.0
- Exploit chance (30 days)
- 0.3%
- Published
- 14 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- The NetX Secure DTLS server sends a HelloVerifyRequest carrying a freshly generated cookie, but never checks the cookie a client returns. The ClientHello parser copies the client's cookie bytes over the value the server issued, and the server then decides whether the client has been verified from the cookie's length a…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 8.7 high
- Remotely exploitable without logging in
References
Original description
The NetX Secure DTLS server sends a HelloVerifyRequest carrying a freshly generated cookie, but never checks the cookie a client returns. The ClientHello parser copies the client's cookie bytes over the value the server issued, and the server then decides whether the client has been verified from the cookie's length alone. A peer that puts any single cookie byte in its first ClientHello skips the verification exchange entirely, so the server has no return-routability check and completes handshakes for forged source addresses.
Last activity 14 Oct 2026. Patch Forecast updates every hour.