CVE-2002-0511: The default configuration of Name Service Cache Daemon (nscd) in Caldera OpenLinux 3.1 and 3.1.1 uses cached P

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HIGH 7.5WATCHLISTDOWNGRADE

CVE-2002-0511 is a high-severity flaw (CVSS 7.5) affecting nscd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The default configuration of Name Service Cache Daemon (nscd) in Caldera OpenLinux 3.1 and 3.1.1 uses cached PTR records instead of consulting the authoritative DNS server for the A record, which could make it easier for remote attackers to bypass applications that restrict access based on host names.

Why this priority

High severity
On your watchlist

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Published	2002-08-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: nscd

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

Am I affected?

Timeline

2002-08-12 04:00 UTCPublished CVE record published
2026-06-16 21:57 UTCUpdated Record last modified

nscd nscd DOWNGRADE

Affected: 2.2.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.4

1. Check installed version

apt-cache policy nscd || rpm -q nscd || nscd --version

2. No fixed release: DOWNGRADE to a release before 2.2.4 (Debian / Ubuntu)

apt-cache madison nscd sudo apt install nscd=<VERSION_BEFORE_2.2.4> sudo apt-mark hold nscd

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

dnf --showduplicates list nscd sudo dnf downgrade nscd-<VERSION_BEFORE_2.2.4> sudo dnf versionlock add nscd

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-2002-0511?

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

Is CVE-2002-0511 being exploited?

CVE-2002-0511 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-2002-0511 affect?

CVE-2002-0511 affects nscd. Severity is high (CVSS 7.5). The default configuration of Name Service Cache Daemon (nscd) in Caldera OpenLinux 3.1 and 3.1.1 uses cached PTR records instead of consulting the authoritative DNS server for the A record, which could make it easier for remote attackers to

How urgent is CVE-2002-0511?

Priority 50/100. High severity; On your watchlist

References

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