CVE-2023-46239

quic-go vulnerable to pointer dereference that can lead to panic

HIGH
7.5
CVSS Score
Published: October 31, 2023 at 03:02 PM UTC
Updated: June 17, 2026 at 06:30 AM UTC
2 products affected across 2 vendorsQuic GoQuic Go

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Severity
HIGH7.5
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

quic-go is an implementation of the QUIC protocol in Go. Starting in version 0.37.0 and prior to version 0.37.3, by serializing an ACK frame after the CRYTPO that allows a node to complete the handshake, a remote node could trigger a nil pointer dereference (leading to a panic) when the node attempted to drop the Handshake packet number space. An attacker can bring down a quic-go node with very minimal effort. Completing the QUIC handshake only requires sending and receiving a few packets. Version 0.37.3 contains a patch. Versions before 0.37.0 are not affected.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0.37.0 ≤ v < 0.37.3
Affected range stops below 0.37.3, so it looks safe — our inference, not a vendor statement
v < 0.37.3
Affected range stops below 0.37.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-248CWE-476

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