CVE-2004-2612: BNC 2.9.0 only grants access when an incorrect password is provided, which allows remote attackers to use the

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HIGH 7.5DOWNGRADE

CVE-2004-2612 is a high-severity flaw (CVSS 7.5) affecting bnc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

BNC 2.9.0 only grants access when an incorrect password is provided, which allows remote attackers to use the functionality intended for authorized users.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bnc

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

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:09 UTCUpdated Record last modified

bnc bnc DOWNGRADE

Affected: 2.9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.9.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.9.0 (Debian / Ubuntu)

apt-cache madison bnc sudo apt install bnc=<VERSION_BEFORE_2.9.0> sudo apt-mark hold bnc

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

dnf --showduplicates list bnc sudo dnf downgrade bnc-<VERSION_BEFORE_2.9.0> sudo dnf versionlock add bnc

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-2004-2612?

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

Is CVE-2004-2612 being exploited?

CVE-2004-2612 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-2004-2612 affect?

CVE-2004-2612 affects bnc. Severity is high (CVSS 7.5). BNC 2.9.0 only grants access when an incorrect password is provided, which allows remote attackers to use the functionality intended for authorized users.

How urgent is CVE-2004-2612?

Priority 45/100. High severity

Related CVEs

CVE-2004-1482 HIGH 7.5 DOWNGRADE The sbuf_getmsg function in BNC incorrectly handles backspace characters, which could allow remote attackers t
CVE-2004-1052 HIGH 10.0 DOWNGRADE MITIGATE Buffer overflow in the getnickuserhost function in BNC 2.8.9, and possibly other versions, allows remote IRC s

References

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