CVE-2006-4309: VNC server on the AK-Systems Windows Terminal 1.2.5 ExVLP is not password protected, which allows remote attac

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HIGH 10.0DOWNGRADE

CVE-2006-4309 is a high-severity flaw (CVSS 10.0) affecting windows terminal. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

VNC server on the AK-Systems Windows Terminal 1.2.5 ExVLP is not password protected, which allows remote attackers to login and view RDP or Citrix sessions.

Why this priority

Critical severity

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Published	2006-08-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ak-systems

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-08-23 19:04 UTCPublished CVE record published
2026-06-16 22:28 UTCUpdated Record last modified

ak-systems windows terminal DOWNGRADE

Affected: 1.2.5_exvlp

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.5_exvlp

1. Check installed version

apt-cache policy windows-terminal || rpm -q windows-terminal || windows-terminal --version

2. No fixed release: DOWNGRADE to a release before 1.2.5_exvlp (Debian / Ubuntu)

apt-cache madison windows-terminal sudo apt install windows-terminal=<VERSION_BEFORE_1.2.5_exvlp> sudo apt-mark hold windows-terminal

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

dnf --showduplicates list windows-terminal sudo dnf downgrade windows-terminal-<VERSION_BEFORE_1.2.5_exvlp> sudo dnf versionlock add windows-terminal

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-2006-4309?

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

Is CVE-2006-4309 being exploited?

CVE-2006-4309 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-2006-4309 affect?

CVE-2006-4309 affects windows terminal. Severity is high (CVSS 10.0). VNC server on the AK-Systems Windows Terminal 1.2.5 ExVLP is not password protected, which allows remote attackers to login and view RDP or Citrix sessions.

How urgent is CVE-2006-4309?

Priority 56/100. Critical severity

Software pages

Windows vulnerabilities · Citrix vulnerabilities · WinRM and RDP vulnerabilities

References

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