CVE-2023-20207: A vulnerability in the logging component of Cisco Duo Authentication Proxy could allow an authenticated, remot

Routine

MEDIUM 4.9DOWNGRADE

CVE-2023-20207 is a medium-severity flaw (CVSS 4.9) affecting authentication proxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in the logging component of Cisco Duo Authentication Proxy could allow an authenticated, remote attacker to view sensitive information in clear text on an affected system. This vulnerability exists because certain unencrypted credentials are stored. An attacker could exploit this vulnerability by accessing the logs on an affected system and obtaining credentials that they may not normally have access to. A successful exploit co

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-532, CWE-312
Published	2023-07-12
Last modified	2026-06-17

Publisher (CNA): Cisco Systems, Inc. · Vendor: duo

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-12 14:15 UTCPublished CVE record published
2026-06-17 05:29 UTCUpdated Record last modified

duo authentication proxy DOWNGRADE

Affected: 5.8.1 · 6.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.8.1

1. Check installed version

apt-cache policy authentication-proxy || rpm -q authentication-proxy || authentication-proxy --version

2. No fixed release: DOWNGRADE to a release before 5.8.1 (Debian / Ubuntu)

apt-cache madison authentication-proxy sudo apt install authentication-proxy=<VERSION_BEFORE_5.8.1> sudo apt-mark hold authentication-proxy

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list authentication-proxy sudo dnf downgrade authentication-proxy-<VERSION_BEFORE_5.8.1> sudo dnf versionlock add authentication-proxy

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-20207?

authentication proxy: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-20207 being exploited?

CVE-2023-20207 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-20207 affect?

CVE-2023-20207 affects authentication proxy. Severity is medium (CVSS 4.9). A vulnerability in the logging component of Cisco Duo Authentication Proxy could allow an authenticated, remote attacker to view sensitive information in clear text on an affected system. This vulnerability exists because certain unencry

How urgent is CVE-2023-20207?

Priority 27/100. No elevated risk signals yet.

Software pages

Cisco vulnerabilities

References

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