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

> An attacker with physical access can bypass Cisco Duo authentication on macOS by using any PIV smart card, regardless of assignment.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Sep 2022
- **Updated:** 6 Nov 2024
- **Also known as:** GHSA-2x3m-h8fc-hm6p

## What is CVE-2022-20662?

CVE-2022-20662 is a medium-severity authentication bypass vulnerability in Cisco Duo, published on 30 Sep 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2022-20662?

It affects 1 product.


Products: Cisco Duo.

## How do I fix CVE-2022-20662?

No fix has been published for CVE-2022-20662 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-20662 being exploited?

There is no known exploitation of CVE-2022-20662 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Duo

- [CVE-2023-20123](https://insights.sbomify.com/CVE-2023-20123/): Cisco Duo Authentication for macOS and Duo Authentication for Windows Logon Offline Credentials Replay Vulnerability (medium 6.3)
- [CVE-2023-20199](https://insights.sbomify.com/CVE-2023-20199/): Cisco Duo Two-Factor Authentication for macOS Authentication Bypass Vulnerability (medium 6.2)
- [CVE-2025-20258](https://insights.sbomify.com/CVE-2025-20258/): Command injection in Cisco Duo (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-20662 and fix it if it is affected.

What it is: CVE-2022-20662 is a medium-severity authentication bypass vulnerability in Cisco Duo, published on 30 Sep 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-20662 in the wild and no public exploit code.

Affected product: Cisco Duo. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2022-20662/ (Markdown: https://insights.sbomify.com/CVE-2022-20662/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-20662
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-20662
- OSV: https://osv.dev/vulnerability/CVE-2022-20662

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From sbomify Insights: https://insights.sbomify.com/CVE-2022-20662/
Summaries are generated and may contain mistakes; the official description above is the record.