CVE-2005-2141: TCP Chat 1.0 allows remote attackers to cause a denial of service (crash) via a long string to the chat servic

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MEDIUM 5.0DOWNGRADE

CVE-2005-2141 is a medium-severity flaw (CVSS 5.0) affecting tcp chat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

TCP Chat 1.0 allows remote attackers to cause a denial of service (crash) via a long string to the chat service, possibly triggering a buffer overflow.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.4% (top 11%)
CISA exploited list	No
Published	2005-07-05
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: jollybox.de

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

Am I affected?

Timeline

2005-07-05 04:00 UTCPublished CVE record published
2026-06-16 22:14 UTCUpdated Record last modified

jollybox.de tcp chat DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy tcp-chat || rpm -q tcp-chat || tcp-chat --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison tcp-chat sudo apt install tcp-chat=<VERSION_BEFORE_1.0> sudo apt-mark hold tcp-chat

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

dnf --showduplicates list tcp-chat sudo dnf downgrade tcp-chat-<VERSION_BEFORE_1.0> sudo dnf versionlock add tcp-chat

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: TCP Chat (TCPX) 1.0 - Denial of Service

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-2005-2141?

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

Is CVE-2005-2141 being exploited?

CVE-2005-2141 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-2005-2141 affect?

CVE-2005-2141 affects tcp chat. Severity is medium (CVSS 5.0). TCP Chat 1.0 allows remote attackers to cause a denial of service (crash) via a long string to the chat service, possibly triggering a buffer overflow.

How urgent is CVE-2005-2141?

Priority 45/100. Public exploit reference

References

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