CVE-2007-3121: Buffer overflow in the CCdecode function in contrib/ntsc-cc.c in the zvbi-ntsc-cc tool in Zapping VBI Library

This month

HIGH 7.5DOWNGRADE

CVE-2007-3121 is a high-severity flaw (CVSS 7.5) affecting zapping vbi library. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the CCdecode function in contrib/ntsc-cc.c in the zvbi-ntsc-cc tool in Zapping VBI Library (ZVBI) before 0.2.25 allows attackers to cause a denial of service (application crash) and possibly execute arbitrary code via long data during a reception error. NOTE: some of these details are obtained from third party information.

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	2.2% (top 17%)
CISA exploited list	No
Published	2007-06-07
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: zapping

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

Am I affected?

Timeline

2007-06-07 21:30 UTCPublished CVE record published
2026-06-16 22:41 UTCUpdated Record last modified

zapping zapping vbi library DOWNGRADE

Affected: 0.2.20 · 0.2.21 · 0.2.22 · 0.2.23 · 0.2.24

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2.20

1. Check installed version

apt-cache policy zapping-vbi-library || rpm -q zapping-vbi-library || zapping-vbi-library --version

2. No fixed release: DOWNGRADE to a release before 0.2.20 (Debian / Ubuntu)

apt-cache madison zapping-vbi-library sudo apt install zapping-vbi-library=<VERSION_BEFORE_0.2.20> sudo apt-mark hold zapping-vbi-library

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

dnf --showduplicates list zapping-vbi-library sudo dnf downgrade zapping-vbi-library-<VERSION_BEFORE_0.2.20> sudo dnf versionlock add zapping-vbi-library

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-2007-3121?

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

Is CVE-2007-3121 being exploited?

CVE-2007-3121 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-2007-3121 affect?

CVE-2007-3121 affects zapping vbi library. Severity is high (CVSS 7.5). Buffer overflow in the CCdecode function in contrib/ntsc-cc.c in the zvbi-ntsc-cc tool in Zapping VBI Library (ZVBI) before 0.2.25 allows attackers to cause a denial of service (application crash) and possibly execute arbitrary code via lon

How urgent is CVE-2007-3121?

Priority 47/100. High severity

References

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