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CVE-2023-20123

14
FAUCET Score

CVE-2023-20123 is a vulnerability in Cisco Duo Two-Factor Authentication for macOS and Duo Authentication for Windows Logon and RDP, allowing an unauthenticated, physical attacker to bypass MFA. The vulnerability stems from improperly expiring session credentials, enabling replay of previously used MFA codes. Rated Medium with a CVSS score of 4.6 (AV:P), it requires physical access but has low attack complexity, potentially leading to unauthorized device access. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.1CPE matchmatch criteria
cpe:2.3:a:cisco:duo:*:*:*:*:*:macos:*:*
< 4.2.2CPE matchmatch criteria
cpe:2.3:a:cisco:duo_authentication_for_windows_logon_and_rdp:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

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

Attack Vector
PHYSICAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.4
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.25%
Probability of exploitation in next 30 days
EPSS Percentile
16.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0025 is in the 32nd percentile among its peer group of 1,531 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

sec.cloudapps.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-duo-replay-knuNKd
Vendor Advisory