CVE-2023-41378 - CVE House
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Status published High CVE-2023-41378

Calico Typha hangs during unclean TLS handshake

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Rodrigo Fior Kuntzer (Github: rodrigorfk)
  • Anthony Tam
  • Behnam Shobiri
  • Shaun Crampton
  • Matt Dupre

References

Affected Vendor

Affected Software

Typha
Vulnerable Versions:
v3.26.0, 0, v3.17.0, v3.16.0

Timeline

Official Publish: November 6th, 2023
Last Modified: September 5th, 2024
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-400 CWE-703

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service
Impact
T1498 Network Denial of Service
Impact