CVE-2006-0223: Directory traversal vulnerability in Shanghai TopCMM 123 Flash Chat Server Software 5.1 allows attackers to cr

Routine

MEDIUM 5.0DOWNGRADE

CVE-2006-0223 is a medium-severity flaw (CVSS 5.0) affecting 123 flash chat server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in Shanghai TopCMM 123 Flash Chat Server Software 5.1 allows attackers to create or overwrite arbitrary files on the server via ".." (dot dot) sequences in the username field.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-22
Published	2006-01-16
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: topcmm computing

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

Am I affected?

Timeline

2006-01-16 21:03 UTCPublished CVE record published
2026-06-16 22:20 UTCUpdated Record last modified

topcmm computing 123 flash chat server DOWNGRADE

Affected: 5.0 · 5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

1. Check installed version

apt-cache policy 123-flash-chat-server || rpm -q 123-flash-chat-server || 123-flash-chat-server --version

2. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison 123-flash-chat-server sudo apt install 123-flash-chat-server=<VERSION_BEFORE_5.0> sudo apt-mark hold 123-flash-chat-server

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

dnf --showduplicates list 123-flash-chat-server sudo dnf downgrade 123-flash-chat-server-<VERSION_BEFORE_5.0> sudo dnf versionlock add 123-flash-chat-server

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-2006-0223?

123 flash chat server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0223 being exploited?

CVE-2006-0223 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-2006-0223 affect?

CVE-2006-0223 affects 123 flash chat server. Severity is medium (CVSS 5.0). Directory traversal vulnerability in Shanghai TopCMM 123 Flash Chat Server Software 5.1 allows attackers to create or overwrite arbitrary files on the server via ".." (dot dot) sequences in the username field.

How urgent is CVE-2006-0223?

Priority 37/100. No elevated risk signals yet.

Related CVEs

CVE-2006-0418 HIGH 7.5 DOWNGRADE Eval injection vulnerability in 123 Flash Chat Server 5.0 and 5.1 allows attackers to execute arbitrary code v

References

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