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Vulnerability record · CVE-2023-41378 · published 6 November 2023

CVE-2023-41378: Tigera calico cloud uncontrolled resource consumption vulnerability

Tigera · Calico Cloud

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.

7.5 CVSS 3.1 High EPSS 0.72% · top 47.9% CWE-400 · Uncontrolled resource consumptionCWE-703 · CWE-703
7.5CVSS 3.1 base score
0.72%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2023-41378), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.