CVE-2000-0843: Buffer overflow in pam_smb and pam_ntdom pluggable authentication modules (PAM) allow remote attackers to exec

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HIGH 10.0DOWNGRADEDOWNGRADE

CVE-2000-0843 is a high-severity flaw (CVSS 10.0) affecting pam smb, pam ntdom. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in pam_smb and pam_ntdom pluggable authentication modules (PAM) allow remote attackers to execute arbitrary commands via a login with a long user name.

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	6.5% (top 6%)
CISA exploited list	No
Published	2000-11-14
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: dave airlie · luke kenneth casson leighton

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

Am I affected?

Timeline

2000-11-14 05:00 UTCPublished CVE record published
2026-06-16 21:52 UTCUpdated Record last modified

dave airlie pam smb DOWNGRADE

Affected: 1.1.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.5

1. Check installed version

apt-cache policy pam-smb || rpm -q pam-smb || pam-smb --version

2. No fixed release: DOWNGRADE to a release before 1.1.5 (Debian / Ubuntu)

apt-cache madison pam-smb sudo apt install pam-smb=<VERSION_BEFORE_1.1.5> sudo apt-mark hold pam-smb

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

dnf --showduplicates list pam-smb sudo dnf downgrade pam-smb-<VERSION_BEFORE_1.1.5> sudo dnf versionlock add pam-smb

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.

luke kenneth casson leighton pam ntdom DOWNGRADE

Affected: 0.23

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.23

1. Check installed version

apt-cache policy pam-ntdom || rpm -q pam-ntdom || pam-ntdom --version

2. No fixed release: DOWNGRADE to a release before 0.23 (Debian / Ubuntu)

apt-cache madison pam-ntdom sudo apt install pam-ntdom=<VERSION_BEFORE_0.23> sudo apt-mark hold pam-ntdom

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

dnf --showduplicates list pam-ntdom sudo dnf downgrade pam-ntdom-<VERSION_BEFORE_0.23> sudo dnf versionlock add pam-ntdom

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-2000-0843?

pam smb: downgrade or apply the listed mitigation; pam ntdom: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2000-0843 being exploited?

CVE-2000-0843 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-2000-0843 affect?

CVE-2000-0843 affects pam smb, pam ntdom. Severity is high (CVSS 10.0). Buffer overflow in pam_smb and pam_ntdom pluggable authentication modules (PAM) allow remote attackers to execute arbitrary commands via a login with a long user name.

How urgent is CVE-2000-0843?

Priority 58/100. Critical severity; EPSS top 6%: very likely to be exploited

Related CVEs

CVE-2003-0686 HIGH 7.5 DOWNGRADE DOWNGRADE Buffer overflow in PAM SMB module (pam_smb) 1.1.6 and earlier, when authenticating to a remote service, allows

References

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