CVE-2012-0033: The CBounceDCCMod::OnPrivCTCP function in bouncedcc.cpp in the bouncedcc module in ZNC 0.200 and 0.202 allows

Routine

MEDIUM 5.0DOWNGRADE

CVE-2012-0033 is a medium-severity flaw (CVSS 5.0) affecting znc-msvc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The CBounceDCCMod::OnPrivCTCP function in bouncedcc.cpp in the bouncedcc module in ZNC 0.200 and 0.202 allows remote attackers to cause a denial of service (crash) via a crafted DCC RESUME request.

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	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-399
Published	2014-04-08
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: znc

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

Am I affected?

Timeline

2014-04-08 14:22 UTCPublished CVE record published
2026-06-16 23:36 UTCUpdated Record last modified

znc znc-msvc DOWNGRADE

Affected: 0.200 · 0.202

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.200

1. Check installed version

apt-cache policy znc-msvc || rpm -q znc-msvc || znc-msvc --version

2. No fixed release: DOWNGRADE to a release before 0.200 (Debian / Ubuntu)

apt-cache madison znc-msvc sudo apt install znc-msvc=<VERSION_BEFORE_0.200> sudo apt-mark hold znc-msvc

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

dnf --showduplicates list znc-msvc sudo dnf downgrade znc-msvc-<VERSION_BEFORE_0.200> sudo dnf versionlock add znc-msvc

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-2012-0033?

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

Is CVE-2012-0033 being exploited?

CVE-2012-0033 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-2012-0033 affect?

CVE-2012-0033 affects znc-msvc. Severity is medium (CVSS 5.0). The CBounceDCCMod::OnPrivCTCP function in bouncedcc.cpp in the bouncedcc module in ZNC 0.200 and 0.202 allows remote attackers to cause a denial of service (crash) via a crafted DCC RESUME request.

How urgent is CVE-2012-0033?

Priority 39/100. No elevated risk signals yet.

Related CVEs

CVE-2013-7049 MEDIUM 4.3 UPGRADE Stack-based buffer overflow in fish.cpp in the Fish plugin for ZNC, as used in ZNC for Windows (znc-msvc) 0.20

References

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