CVE-2022-20662

Authentication bypass via incorrect smart card matching

Published Sep 30, 2022 · Updated Nov 6, 2024

Authentication bypass in Cisco Duo for macOS before 2.0.0 allows physically proximate attackers to log in with an unassigned PIV smart card. The smart card login path fails to match the card's assigned user to the authenticating user before allowing the configured smart-card 2FA bypass. Physical access, a PIV smart card, and enabled smart-card bypass are required; successful exploitation defeats Duo authentication for the targeted Mac account.

CVSS severity6.1
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Cisco Duo for macOS before 2.0.0 allows physically proximate attackers to log in with an unassigned PIV smart card. The smart card login path fails to match the card's assigned user to the authenticating user before allowing the configured smart-card 2FA bypass. Physical access, a PIV smart card, and enabled smart-card bypass are required; successful exploitation defeats Duo authentication for the targeted Mac account.

The record

CVE
CVE-2022-20662
Published
Sep 30, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco Duo
Classifications
CWE-287, T1078
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 30, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Duoversion=n/a

Published CVSS scores

6.8NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.1Cisco Systems, Inc.CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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