CVE-2002-0425: mIRC DCC server protocol allows remote attackers to gain sensitive information such as alternate IRC nicknames

Routine

MEDIUM 5.0DOWNGRADE

CVE-2002-0425 is a medium-severity flaw (CVSS 5.0) affecting mirc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mIRC DCC server protocol allows remote attackers to gain sensitive information such as alternate IRC nicknames via a "100 testing" message in a DCC connection request that cannot be ignored or canceled by the user, which may leak the alternate nickname in a response message.

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	1.5% (top 25%)
CISA exploited list	No
Published	2002-08-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: khaled mardam-bey

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

Am I affected?

Timeline

2002-08-12 04:00 UTCPublished CVE record published
2026-06-16 21:57 UTCUpdated Record last modified

khaled mardam-bey mirc DOWNGRADE

Affected: 6.0 · 6.0_1

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy mirc || rpm -q mirc || mirc --version

2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison mirc sudo apt install mirc=<VERSION_BEFORE_6.0> sudo apt-mark hold mirc

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

dnf --showduplicates list mirc sudo dnf downgrade mirc-<VERSION_BEFORE_6.0> sudo dnf versionlock add mirc

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-2002-0425?

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

Is CVE-2002-0425 being exploited?

CVE-2002-0425 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-2002-0425 affect?

CVE-2002-0425 affects mirc. Severity is medium (CVSS 5.0). mIRC DCC server protocol allows remote attackers to gain sensitive information such as alternate IRC nicknames via a "100 testing" message in a DCC connection request that cannot be ignored or canceled by the user, which may leak the altern

How urgent is CVE-2002-0425?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2019-6453 HIGH 8.1 UPGRADE mIRC before 7.55 allows remote command execution by using argument injection through custom URI protocol handl
CVE-2011-5282 MEDIUM 5.3 UPGRADE mIRC prior to 7.22 has a message leak because chopping of outbound messages is mishandled.
CVE-2008-7314 HIGH 7.5 UPGRADE mIRC before 6.35 allows attackers to cause a denial of service (crash) via a long nickname.
CVE-2008-4449 HIGH 9.3 DOWNGRADE Stack-based buffer overflow in mIRC 6.34 allows remote attackers to execute arbitrary code via a long hostname
CVE-2007-4402 MEDIUM 6.8 DOWNGRADE Multiple unspecified scripts in mIRC allow user-assisted remote attackers to execute arbitrary code via the '|

References

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