What’s Vulnerable › Vulnerabilities

CVE-2023-39321: Panic when processing post-handshake message on QUIC connections in crypto/tls

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-08 · updated 2026-06-17
• Weakness: CWE-400

Description

Processing an incomplete post-handshake message for a QUIC connection can cause a panic.

Affected products

• Go: from 1.21.0 before 1.21.1 — fixed in 1.21.1

How to fix

Upgrade to a fixed version: Go 1.21.1. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/523039
• https://go.dev/issue/62266
• https://groups.google.com/g/golang-dev/c/2C5vbR-UNkI/m/L1hdrPhfBAAJ
• https://pkg.go.dev/vuln/GO-2023-2044
• https://security.gentoo.org/glsa/202311-09
• https://security.netapp.com/advisory/ntap-20231020-0004/
• https://go.dev/cl/523039
• https://go.dev/issue/62266
• https://groups.google.com/g/golang-dev/c/2C5vbR-UNkI/m/L1hdrPhfBAAJ
• https://pkg.go.dev/vuln/GO-2023-2044
• https://security.gentoo.org/glsa/202311-09
• https://security.netapp.com/advisory/ntap-20231020-0004/

Get alerted when CVE-2023-39321 or the next vulnerability affects your stack