CVE-1999-0002: Buffer overflow in NFS mountd gives root access to remote attackers, mostly in Linux systems.

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HIGH 10.0WATCHLISTMITIGATEMITIGATEMITIGATE

CVE-1999-0002 is a high-severity flaw (CVSS 10.0) affecting bsd os, openlinux, linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in NFS mountd gives root access to remote attackers, mostly in Linux systems.

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	27.2% (top 2%)
CISA exploited list	No
Weakness	CWE-119
Published	1998-10-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bsdi · caldera · redhat

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

Am I affected?

Timeline

1998-10-12 04:00 UTCPublished CVE record published
2026-06-16 21:47 UTCUpdated Record last modified

bsdi bsd os MITIGATE

Affected: 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

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.

caldera openlinux MITIGATE

Affected: 1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2

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.

redhat linux MITIGATE

Affected: 2.0 · 2.1 · 3.0.3 · 4.0 · 4.1 · 4.2 · 5.0 · 5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · python-nodeenv · FIXED · 1.12.0-1.eln159 · FEDORA-2026-4081f7f008 · source

sudo dnf upgrade --advisory=FEDORA-2026-4081f7f008

Fedora 46 · udns · FIXED · 0.7-1.fc46 · FEDORA-2026-e747764426 · source

sudo dnf upgrade --advisory=FEDORA-2026-e747764426

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: RedHat Linux 5.1 / Caldera OpenLinux Standard 1.2 - Mountd

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-1999-0002?

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

Is CVE-1999-0002 being exploited?

CVE-1999-0002 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-1999-0002 affect?

CVE-1999-0002 affects bsd os, openlinux, linux. Severity is high (CVSS 10.0). Buffer overflow in NFS mountd gives root access to remote attackers, mostly in Linux systems.

How urgent is CVE-1999-0002?

Priority 70/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference; On your watchlist

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References

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