Security readout for executives and security teams
Plain-English summary
This entry flags that a legacy NIS+ (Network Information Service Plus) component is running on a system. NIS+ was Sun Microsystems' directory service used mainly on older Solaris and Unix networks to share user, host, and configuration data. Its mere presence is not an attack, but it is an outdated service that may broaden the attack surface if it is not actively needed.
Executive priority
Low priority for most modern environments. Treat as a hygiene item rather than an incident: worth confirming during routine audits of legacy Unix systems, but not a driver for emergency change. If NIS+ is found running, plan orderly decommissioning to reduce legacy attack surface.
Technical view
CVE-1999-0653 is a configuration/informational finding indicating that a service related to NIS+ (typically rpc.nisd or associated RPC-based components) is active. The public record contains no vendor, product, version, CWE, or CVSS data, and does not describe a specific memory or logic flaw. It is best treated as a hardening indicator rather than a discrete vulnerability, flagging exposure of legacy RPC directory services to the network.
Likely exposure
Limited to environments still running Solaris or other Unix systems with NIS+ enabled. Modern enterprises have largely migrated to LDAP, Active Directory, or SSSD, so exposure is typically confined to legacy infrastructure, isolated lab systems, or unmaintained hosts inherited through acquisitions.
Exploitation context
There is no CISA KEV listing and no public evidence of active exploitation tied to this specific CVE. The entry describes service presence, not a weaponizable flaw. Historical NIS+ weaknesses relate to weak RPC authentication and information disclosure, but the source bundle does not attribute specific exploit activity here.
Researcher notes
The CVE record is essentially a configuration flag from the late-1990s CVE effort with no vendor, CPE, CWE, or CVSS data. Treat findings tagged with this ID as an indicator that a legacy RPC directory service is exposed, and pivot to concrete NIS+/RPC vulnerabilities and vendor advisories to assess real risk. Confidence is limited by the sparse source bundle.
Mitigation direction
- Inventory hosts for running NIS+ services (rpc.nisd) and confirm whether they are still required.
- Disable NIS+ and related RPC services on systems that no longer depend on them.
- Restrict RPC portmapper and NIS+ ports at the network boundary if the service must remain.
- Migrate remaining directory functions to LDAP, Active Directory, or SSSD where feasible.
- Consult vendor (historically Sun/Oracle) guidance for any residual Solaris hardening steps.
Validation and detection
- Enumerate listening services and RPC programs to confirm whether NIS+ components are active.
- Check service manifests or init scripts for rpc.nisd or nisplus references and their enablement state.
- Verify firewall and segmentation rules block untrusted access to RPC and NIS+ ports.
- Cross-check host inventory against the authoritative directory service to confirm NIS+ is no longer relied upon.
- Re-scan after remediation to confirm the service is stopped and not restarted at boot.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-1999-0653 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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://www.cve.org/CVERecord?id=CVE-1999-0653CVE 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.