CVE-2023-39321 Panic when processing post-handshake message on QUIC connections in crypto/tls
An attacker can cause a panic and denial of service by sending incomplete post-handshake messages over QUIC connections in the Go crypto/tls library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-39321?
CVE-2023-39321 is a high-severity denial of service vulnerability in Golang Go, published on 8 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Processing an incomplete post-handshake message for a QUIC connection can cause a panic.
Weakness: CWE-400
Which versions are affected by CVE-2023-39321?
2 open source packages ship an affected version, including golang and stdlib. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | From 1.21.0 | 1.21.1 |
stdlib Go | From 1.21.0-0 | 1.21.1 |
Products include Golang Go.
How do I fix CVE-2023-39321?
Upgrade golang to 1.21.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-39321 being exploited?
There is no known exploitation of CVE-2023-39321 in the wild and no public exploit code.
Other vulnerabilities in Golang Go
- CVE-2020-0601 Microsoft Windows CryptoAPI Spoofing
- CVE-2026-27143 Missing bound checks can lead to memory corruption in safe Go in cmd/compile
- CVE-2024-24790 Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses in net/netip
- CVE-2023-39320 Arbitrary code execution via go.mod toolchain directive in cmd/go
- CVE-2023-24540 Improper handling of JavaScript whitespace in html/template
Sources
Also known as BELL-CVE-2023-39321, BIT-golang-2023-39321, GHSA-9v7r-x7cv-v437, GO-2023-2044.