Security readout for executives and security teams
Plain-English summary
A server on your network is running the Network File System (NFS) service without actually sharing any files. This is a configuration hygiene issue: an unused service is exposed, expanding the attack surface without providing any business value. It is not itself a vulnerability that leaks data, but it signals sloppy system hardening and gives attackers one more service to probe.
Executive priority
Low urgency housekeeping item. Address during routine hardening cycles, not incident response. Fixing it reduces attack surface, improves scanner posture, and supports compliance frameworks that require disabling unused services.
Technical view
CVE-1999-0548 describes a superfluous NFS daemon running on a host with no exported or imported file systems. The finding is a configuration exposure recorded in the CVE dictionary rather than a specific software flaw. Risk stems from an unnecessary network service listening on RPC/NFS ports, which increases enumeration signal, potential exposure to future NFS or RPC bugs, and violates least-service hardening baselines.
Likely exposure
Any host that has nfsd, rpc.mountd, or related NFS/RPC services running while no shares are defined. Historically common on legacy Unix and Linux servers built from broad default installs. Exposure is greatest when these RPC ports are reachable from untrusted networks or lack host-based firewalling.
Exploitation context
Not listed in CISA KEV and the source bundle records no active exploitation. This entry is a hardening/configuration finding, not a weaponized flaw. It is typically flagged by vulnerability scanners as an unnecessary service. Attackers benefit indirectly by using the exposed RPC/NFS surface for reconnaissance or by chaining against future NFS-related CVEs.
Researcher notes
This is a legacy 1999-era CVE dictionary entry describing a misconfiguration class rather than a code vulnerability. No CVSS, CWE, or affected product data is provided in the source bundle. Evidence is limited to the CVE record and an IBM X-Force reference. Treat findings as configuration audit output; validate through service enumeration rather than exploit testing.
Mitigation direction
- Disable and mask NFS server daemons on hosts that do not export file systems.
- Remove or uninstall NFS server packages where the role is not required.
- Restrict RPC portmapper and NFS ports at host and network firewalls.
- Enforce a hardening baseline that disables unused services by default.
- Confirm no dependent applications rely on the NFS daemon before shutdown.
Validation and detection
- Enumerate listening services and confirm no NFS or rpc.mountd processes are active.
- Query rpcinfo or portmapper to verify NFS programs are not registered.
- Scan the host externally for TCP/UDP 111 and 2049 exposure.
- Review configuration management to ensure the service stays disabled after reboot.
- Re-run the vulnerability scanner to confirm the finding clears.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-1999-0548 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0548CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.