CVE-2002-2271: Buffer overflow in BigFun 1.51b IRC client, when the Direct Client Connection (DCC) option is used, allows rem

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MEDIUM 5.0DOWNGRADE

CVE-2002-2271 is a medium-severity flaw (CVSS 5.0) affecting bigfun. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in BigFun 1.51b IRC client, when the Direct Client Connection (DCC) option is used, allows remote attackers to cause a denial of service (crash) via a long string.

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	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-119
Published	2002-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bigfun

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

Am I affected?

Timeline

2002-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:00 UTCUpdated Record last modified

bigfun bigfun DOWNGRADE

Affected: 1.5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.5.1 (Debian / Ubuntu)

apt-cache madison bigfun sudo apt install bigfun=<VERSION_BEFORE_1.5.1> sudo apt-mark hold bigfun

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

dnf --showduplicates list bigfun sudo dnf downgrade bigfun-<VERSION_BEFORE_1.5.1> sudo dnf versionlock add bigfun

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-2002-2271?

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

Is CVE-2002-2271 being exploited?

CVE-2002-2271 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-2002-2271 affect?

CVE-2002-2271 affects bigfun. Severity is medium (CVSS 5.0). Buffer overflow in BigFun 1.51b IRC client, when the Direct Client Connection (DCC) option is used, allows remote attackers to cause a denial of service (crash) via a long string.

How urgent is CVE-2002-2271?

Priority 40/100. Public exploit reference

References

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