CVE-1999-0747: Denial of service in BSDi Symmetric Multiprocessing (SMP) when an fstat call is made when the system has a hig

Routine

LOW 2.1MITIGATE

CVE-1999-0747 is a low-severity flaw (CVSS 2.1) affecting bsd os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Denial of service in BSDi Symmetric Multiprocessing (SMP) when an fstat call is made when the system has a high CPU load.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	2.1 (Low)
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Published	1999-08-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bsdi

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

Am I affected?

Timeline

1999-08-18 04:00 UTCPublished CVE record published
2026-06-16 21:48 UTCUpdated Record last modified

bsdi bsd os MITIGATE

Affected: 4.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-1999-0747?

bsd os: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-1999-0747 being exploited?

CVE-1999-0747 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-1999-0747 affect?

CVE-1999-0747 affects bsd os. Severity is low (CVSS 2.1). Denial of service in BSDi Symmetric Multiprocessing (SMP) when an fstat call is made when the system has a high CPU load.

How urgent is CVE-1999-0747?

Priority 13/100. No elevated risk signals yet.

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References

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