CVE-2023-41378

Name: CVE-2023-41378
Creator: NVD / NIST
Published: 2023-11-06T16:15:42.273+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.72%

Last modified Jun 17, 2026

CVE-2023-41378 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. . EPSS estimates a 0.72% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.72%

49.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tigera	Calico Cloud	< 18.0.0
Tigera	Calico Enterprise	< 3.15.4
Tigera	Calico Enterprise	>= 3.16.0, < 3.16.4
Tigera	Calico Enterprise	>= 3.17.0, < 3.17.2
Tigera	Calico Os	< 3.25.2
Tigera	Calico Os	>= 3.26.0, < 3.26.3

References

https://github.com/projectcalico/calico/pull/7908Issue Tracking
https://github.com/projectcalico/calico/pull/7993Issue Tracking, Patch
https://www.tigera.io/security-bulletins-tta-2023-001/Vendor Advisory
https://github.com/projectcalico/calico/pull/7908Issue Tracking
https://github.com/projectcalico/calico/pull/7993Issue Tracking, Patch
https://www.tigera.io/security-bulletins-tta-2023-001/Vendor Advisory

Timeline

Published: Nov 6, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-41378?

How severe is CVE-2023-41378?

CVE-2023-41378 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.

How do I fix CVE-2023-41378?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-41378?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST