TI-2024-13235 Aliases CVE-2024-20301 GHSA-8cv6-h2pr-548g

Improper authentication in Cisco Duo

LOW 27CWE-287Published 2024-03-06 · Updated 2024-08-01

Key facts

Attack vector: Physical
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

A vulnerability in Cisco Duo Authentication for Windows Logon and RDP could allow an authenticated, physical attacker to bypass secondary authentication and access an affected Windows device. This vulnerability is due to a failure to invalidate locally created trusted sessions after a reboot of the affected device. An attacker with primary user credentials could exploit this vulnerability by attempting to authenticate to an affected device. A successful exploit could allow the attacker to access the affected device without valid permissions.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00266 18th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cisco	Cisco Duo	1.0.1; 1.0.2; 1.0.3; 1.0.4; 1.1.0; 1.1.1; 2.0.0	—	No fix listed	CNA

Cisco Duo VendorCisco Affected 1.0.1; 1.0.2; 1.0.3; 1.0.4; 1.1.0; 1.1.1; 2.0.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cisco:duo_authentication_for_windows_logon_and_rdp::::::::	4.2.0 to before 4.3.0	Vulnerable	Cisco

cpe:2.3:a:cisco:duo_authentication_for_windows_logon_and_rdp:*:*:*:*:*:*:*:* Versions 4.2.0 to before 4.3.0 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2024-20301
2026-10-03 Alias added: GHSA-8cv6-h2pr-548g

References

Advisory 1

cisco-sa-duo-win-bypass-pn42KKBm

TI-2020-02976 Duo Authentication for Windows Logon and RDP Privilege Escalation Vulnerability CVSS 3.1HIGH 7.8
TI-2023-06830 Cisco Duo Authentication for macOS and Duo Authentication for Windows Logon Offline Credentials Replay Vulnerability CVSS 3.1MEDIUM 6.3
TI-2024-13226 Information disclosure in Cisco Duo CVSS 3.1MEDIUM 5.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences