CVE-2009-1639: Stack-based buffer overflow in Nucleus Data Recovery Kernel Recovery for Novell 4.03 allows user-assisted atta

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HIGH 9.3DOWNGRADE

CVE-2009-1639 is a high-severity flaw (CVSS 9.3) affecting kernel recovery. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in Nucleus Data Recovery Kernel Recovery for Novell 4.03 allows user-assisted attackers to execute arbitrary code via a crafted .NKNT file.

Why this priority

Critical severity
Public exploit reference

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

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	2.8% (top 13%)
CISA exploited list	No
Weakness	CWE-119
Published	2009-05-15
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: nucleustechnologies

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

Am I affected?

Timeline

2009-05-15 15:30 UTCPublished CVE record published
2026-06-16 23:07 UTCUpdated Record last modified

nucleustechnologies kernel recovery DOWNGRADE

Affected: 4.03 novell

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.03

1. Check installed version

apt-cache policy kernel-recovery || rpm -q kernel-recovery || kernel-recovery --version

2. No fixed release: DOWNGRADE to a release before 4.03 (Debian / Ubuntu)

apt-cache madison kernel-recovery sudo apt install kernel-recovery=<VERSION_BEFORE_4.03> sudo apt-mark hold kernel-recovery

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

dnf --showduplicates list kernel-recovery sudo dnf downgrade kernel-recovery-<VERSION_BEFORE_4.03> sudo dnf versionlock add kernel-recovery

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-2009-1639?

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

Is CVE-2009-1639 being exploited?

CVE-2009-1639 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-2009-1639 affect?

CVE-2009-1639 affects kernel recovery. Severity is high (CVSS 9.3). Stack-based buffer overflow in Nucleus Data Recovery Kernel Recovery for Novell 4.03 allows user-assisted attackers to execute arbitrary code via a crafted .NKNT file.

How urgent is CVE-2009-1639?

Priority 59/100. Critical severity; Public exploit reference

Related CVEs

CVE-2009-1640 HIGH 9.3 DOWNGRADE Stack-based buffer overflow in Nucleus Data Recovery Kernel Recovery for Macintosh 4.04 allows user-assisted a

References

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