CVE-2022-20662: Cisco Duo for macOS Authentication Bypass Vulnerability

Severity: medium (CVSS 6.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-09-30 · updated 2026-06-17
Weakness: CWE-287

Description

A vulnerability in the smart card login authentication of Cisco Duo for macOS could allow an unauthenticated attacker with physical access to bypass authentication. This vulnerability exists because the assigned user of a smart card is not properly matched with the authenticating user. An attacker could exploit this vulnerability by configuring a smart card login to bypass Duo authentication. A successful exploit could allow the attacker to use any personal identity verification (PIV) smart card for authentication, even if the smart card is not assigned to the authenticating user.

Affected products

Cisco Duo: before 2.0.0 — fixed in 2.0.0

How to fix

Upgrade to a fixed version: Cisco Duo 2.0.0. Check the vendor advisory for mitigations.

References

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