A vulnerability in the offline access mode of Cisco Duo Two-Factor Authentication for macOS and Duo Authentication for Windows Logon and RDP could allow an unauthenticated, physical attacker to replay valid user session credentials and gain unauthorized access to an affected macOS or Windows device. This vulnerability exists because session credentials do not properly expire. An attacker could exploit this vulnerability by replaying previously used multifactor authentication (MFA) codes to bypass MFA protection. A successful exploit could allow the attacker to gain unauthorized access to the affected device.
Published 2023-04-05 19:15:08
Updated 2023-04-12 19:06:57
View at NVD,   CVE.org
Vulnerability category: Bypass

Exploit prediction scoring system (EPSS) score for CVE-2023-20123

Probability of exploitation activity in the next 30 days EPSS Score History
~ 20 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-20123

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
Cisco Systems, Inc.

CWE ids for CVE-2023-20123

  • A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).
    Assigned by:
    • nvd@nist.gov (Primary)
    • ykramarz@cisco.com (Secondary)

References for CVE-2023-20123

Products affected by CVE-2023-20123

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