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Vulnerability record · CVE-2006-0900 · published 27 February 2006

CVE-2006-0900: FreeBSD nfsd remote denial of service via crafted NFS mount request

Freebsd · Freebsd

The nfsd daemon in the FreeBSD 6.0 kernel mishandles a crafted NFS mount request, allowing a remote attacker to crash or hang the service. The flaw is remotely reachable without authentication, so any host exposing NFS is at risk of losing file-sharing availability.

7.8 CVSS 2.0 High EPSS 65% · top 0.8%
7.8CVSS 2.0 base score
65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References
16 Jun 2026Last modified by NVD

Description

nfsd in FreeBSD 6.0 kernel allows remote attackers to cause a denial of service via a crafted NFS mount request, as demonstrated by the ProtoVer NFS test suite.

AV:N/AC:L/Au:N/C:N/I:N/A:C

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 19 September 2026. Confidence: medium.

high priorityRemote, unauthenticated availability-only denial of service with a high CVSS score and very high EPSS probability, though no known active exploitation is recorded.

What it is

The nfsd daemon in the FreeBSD 6.0 kernel mishandles a crafted NFS mount request, allowing a remote attacker to crash or hang the service. The flaw is remotely reachable without authentication, so any host exposing NFS is at risk of losing file-sharing availability.

Impact

An attacker can cause a denial of service against the NFS service, disrupting file access for all clients of the affected server. The CVSS vector indicates complete availability loss with no confidentiality or integrity impact.

Attack surface

Reached over the network through NFS mount requests to the nfsd service; the AV:N/AC:L/Au:N vector indicates no authentication or user interaction is required.

Exploitation

Not listed in CISA KEV and no public exploit references are tagged in the record, but EPSS is high at roughly 0.65 (99th percentile), suggesting elevated likelihood of attempted exploitation.

What to do

  • Apply the FreeBSD security advisory FreeBSD-SA-06:10.nfs fix or upgrade to a corrected FreeBSD release.
  • Restrict NFS access to trusted networks using firewall rules and export controls.
  • Disable or stop nfsd on hosts that do not require NFS file sharing.
  • Monitor vendor advisories for any follow-up patches or workarounds.

Detection

  • Monitor nfsd logs and system logs for crashes, restarts or abnormal termination.
  • Alert on unexpected NFS mount requests from untrusted source addresses.
  • Track service availability of NFS endpoints for sudden outages or hangs.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:10.nfs.asc
http://lists.immunitysec.com/pipermail/dailydave/2006-February/002982.html
http://secunia.com/advisories/19017 Vendor Advisory
http://securityreason.com/securityalert/521
http://www.osvdb.org/23511
http://www.securityfocus.com/bid/16838
https://exchange.xforce.ibmcloud.com/vulnerabilities/24918
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:10.nfs.asc
http://lists.immunitysec.com/pipermail/dailydave/2006-February/002982.html
http://secunia.com/advisories/19017 Vendor Advisory
http://securityreason.com/securityalert/521
http://www.osvdb.org/23511
http://www.securityfocus.com/bid/16838
https://exchange.xforce.ibmcloud.com/vulnerabilities/24918

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Source: NIST National Vulnerability Database (record CVE-2006-0900), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.