CVE-2022-36436: OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator

Q: How do I fix CVE-2022-36436?

twisted vnc authentication proxy: upgrade to 1.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2022-36436 being exploited?

CVE-2022-36436 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-36436 affect?

CVE-2022-36436 affects twisted vnc authentication proxy. Severity is critical (CVSS 9.8). OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator authentication-bypass vulnerability that could allow a malicious actor to gain unauthorized access to a VNC session or to disconne

Q: How urgent is CVE-2022-36436?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2022-36436 is a critical-severity flaw (CVSS 9.8) affecting twisted vnc authentication proxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator authentication-bypass vulnerability that could allow a malicious actor to gain unauthorized access to a VNC session or to disconnect a legitimate user from a VNC session. A remote attacker with network access to the proxy server could leverage this vulnerability to connect to VNC servers protected by the proxy server without providing any

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-287
Published	2022-09-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: osuosl

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

Am I affected?

Timeline

2022-09-14 11:15 UTCPublished CVE record published
2026-06-17 04:53 UTCUpdated Record last modified

osuosl twisted vnc authentication proxy UPGRADE

Affected: < 1.2.0

Fixed in: 1.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade twisted-vnc-authentication-proxy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade twisted-vnc-authentication-proxy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2022-36436?

twisted vnc authentication proxy: upgrade to 1.2.0. Exact commands for each OS are on this page.

Is CVE-2022-36436 being exploited?

CVE-2022-36436 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-2022-36436 affect?

CVE-2022-36436 affects twisted vnc authentication proxy. Severity is critical (CVSS 9.8). OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator authentication-bypass vulnerability that could allow a malicious actor to gain unauthorized access to a VNC session or to disconne

How urgent is CVE-2022-36436?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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