CVE-2026-19377

Improper certificate validation in Cato Client tunnel handshake

Published Oct 15, 2026 CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Description
Improper certificate validation in the tunnel handshake in Cato Client allows a man-in-the-middle attacker to impersonate a Cato Point of Presence (PoP) server and intercept or modify tunnel traffic.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper certificate validation in the tunnel handshake in Cato Client allows a man-in-the-middle attacker to impersonate a Cato Point of Presence (PoP) server and intercept or modify tunnel traffic.
Title Improper certificate validation in Cato Client tunnel handshake
Weaknesses CWE-295
References
Metrics cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

No data.

Weaknesses

Sources

Status
PUBLISHED
Assigner
Cato
Published
Updated
Oct 15, 2026, 2:22 PM
Reserved
Aug 9, 2026, 1:31 PM
Status
Deferred
Published
Oct 15, 2026, 7:17 AM
Modified
Oct 16, 2026, 8:04 PM