NULL pointer dereference in quic-go - CVE-2023-46239
Published: October 27, 2023 / Updated: April 25, 2026
Vulnerability identifier: #VU127911
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2023-46239
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: quic-go
Affected software:
quic-go
quic-go
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a nil pointer dereference in the handshake packet number space handling when completing the handshake with an unexpected frame serialization order. A remote attacker can send packets that serialize an ACK frame after the CRYPTO frame that completes the handshake to cause a denial of service.
Completing the QUIC handshake only requires sending and receiving a few packets.
How to mitigate CVE-2023-46239
Install security update from vendor's website.