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CVE-2023-41378— Calico Typha hangs during unclean TLS handshake

Quick assessment

Affected
Calico Typha
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tigera Calico是美国Tigera公司的一套针对容器、虚拟机和主机工作负载的开源网络安全解决方案。 Tigera Calico v3.26.3之前版本存在安全漏洞，该漏洞源于客户端TLS握手可能会无限期阻止服务器，导致拒绝服务。

CVSS 7.5 · High EPSS 0.72% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-41378

Vulnerability Information
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Vulnerability Title
Calico Typha hangs during unclean TLS handshake
Source: CVE Program / CVE List V5
Vulnerability Description
In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is performed inside the main server handle for loop without any timeout allowing an unclean TLS handshake to block the main loop indefinitely while other connections will be idle waiting for that handshake to finish.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Tigera Calico 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tigera Calico是美国Tigera公司的一套针对容器、虚拟机和主机工作负载的开源网络安全解决方案。 Tigera Calico v3.26.3之前版本存在安全漏洞，该漏洞源于客户端TLS握手可能会无限期阻止服务器，导致拒绝服务。
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
Calico Typha v3.26.0 ~ v3.26.2 -
Tigera Typha v3.17.0 ~ v3.17.1 -

II. Public POCs for CVE-2023-41378

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8762 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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POC zip download
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III. Intelligence Information for CVE-2023-41378

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Patches & Fixes for CVE-2023-41378 (2)

Other References for CVE-2023-41378 (1)

IV. Related Vulnerabilities

Same weakness: CWE-400