CVE-2023-39321— Panic when processing post-handshake message on QUIC connections in crypto/tls
Quick assessment
Affected
Go standard library crypto/tls
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Google Golang是美国谷歌（Google）公司的一种静态强类型、编译型语言。Go的语法接近C语言，但对于变量的声明有所不同。Go支持垃圾回收功能。Go的并行模型是以东尼·霍尔的通信顺序进程（CSP）为基础，采取类似模型的其他语言包括Occam和Limbo，但它也具有Pi运算的特征，比如通道传输。在1.8版本中开放插件（Plugin）的支持，这意味着现在能从Go中动态加载部分函数。 Google Golang 存在安全漏洞，该漏洞源于处理QUIC连接的不完整握手后消息可能会导致恐慌。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-39321
Vulnerability Information
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Vulnerability Title
Panic when processing post-handshake message on QUIC connections in crypto/tls
Source: CVE Program / CVE List V5
Vulnerability Description
Processing an incomplete post-handshake message for a QUIC connection can cause a panic.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Golang 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Golang是美国谷歌（Google）公司的一种静态强类型、编译型语言。Go的语法接近C语言，但对于变量的声明有所不同。Go支持垃圾回收功能。Go的并行模型是以东尼·霍尔的通信顺序进程（CSP）为基础，采取类似模型的其他语言包括Occam和Limbo，但它也具有Pi运算的特征，比如通道传输。在1.8版本中开放插件（Plugin）的支持，这意味着现在能从Go中动态加载部分函数。 Google Golang 存在安全漏洞，该漏洞源于处理QUIC连接的不完整握手后消息可能会导致恐慌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Go standard library | crypto/tls | 1.21.0-0 ~ 1.21.1 | - |
|
II. Public POCs for CVE-2023-39321
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2023-39321 (2)
Other References for CVE-2023-39321 (4)
Same Patch Batch · Go standard library · 2023-09-08 · 4 CVEs total
| CVE-2023-39322 | Memory exhaustion in QUIC connection handling in crypto/tls | |
| CVE-2023-39319 | Improper handling of special tags within script contexts in html/template | |
| CVE-2023-39318 | Improper handling of HTML-like comments in script contexts in html/template |
IV. Related Vulnerabilities
Same product: crypto/tls
-
CVE-2026-56862
Limit handshake messages we are willing to accept post-hands -
CVE-2026-42505
Invoking Encrypted Client Hello privacy leak in crypto/tls -
CVE-2026-32283
Unauthenticated TLS 1.3 KeyUpdate record can cause persisten -
CVE-2025-68121
Unexpected session resumption in crypto/tls -
CVE-2025-61730
Handshake messages may be processed at the incorrect encrypt
Same vendor: Go standard library
-
CVE-2026-56860
Avoid quadratic complexity in resolvePath in net/url -
CVE-2026-56858
Fix Javascript regexp context tracking in html/template -
CVE-2026-56862
Limit handshake messages we are willing to accept post-hands -
CVE-2026-56859
Add recursion depth guard during decode in encoding/xml -
CVE-2026-33818
Enforce maximum recursion depth in encoding/asn1
V. Comments for CVE-2023-39321
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