CVE-2006-4126: The dc_chat function in cmd.dc.c in DConnect Daemon 0.7.0 and earlier allows remote attackers to cause a denia

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MEDIUM 5.0DOWNGRADE

CVE-2006-4126 is a medium-severity flaw (CVSS 5.0) affecting dconnect daemon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The dc_chat function in cmd.dc.c in DConnect Daemon 0.7.0 and earlier allows remote attackers to cause a denial of service (application crash) by sending a client message before providing the nickname, which triggers a null pointer dereference.

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	9.0% (top 5%)
CISA exploited list	No
Published	2006-08-14
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: dconnect

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

Am I affected?

Timeline

2006-08-14 23:04 UTCPublished CVE record published
2026-06-16 22:28 UTCUpdated Record last modified

dconnect dconnect daemon DOWNGRADE

Affected: 0.0.2 · 0.0.3 · 0.7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.2

1. Check installed version

apt-cache policy dconnect-daemon || rpm -q dconnect-daemon || dconnect-daemon --version

2. No fixed release: DOWNGRADE to a release before 0.0.2 (Debian / Ubuntu)

apt-cache madison dconnect-daemon sudo apt install dconnect-daemon=<VERSION_BEFORE_0.0.2> sudo apt-mark hold dconnect-daemon

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

dnf --showduplicates list dconnect-daemon sudo dnf downgrade dconnect-daemon-<VERSION_BEFORE_0.0.2> sudo dnf versionlock add dconnect-daemon

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: DConnect Daemon DC Chat - 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-2006-4126?

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

Is CVE-2006-4126 being exploited?

CVE-2006-4126 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-2006-4126 affect?

CVE-2006-4126 affects dconnect daemon. Severity is medium (CVSS 5.0). The dc_chat function in cmd.dc.c in DConnect Daemon 0.7.0 and earlier allows remote attackers to cause a denial of service (application crash) by sending a client message before providing the nickname, which triggers a null pointer derefere

How urgent is CVE-2006-4126?

Priority 46/100. EPSS top 5%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2006-4127 MEDIUM 4.6 DOWNGRADE Multiple format string vulnerabilities in DConnect Daemon 0.7.0 and earlier allow remote administrators to exe
CVE-2006-4125 HIGH 7.5 DOWNGRADE Stack-based buffer overflow in main.c in DConnect Daemon 0.7.0 and earlier allows remote attackers to execute

References

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