Security readout for executives and security teams
Plain-English summary
An old version of cfingerd, a Unix "finger" service, responds to a wildcard query (search.**@target) by returning a full list of user accounts on the machine. Attackers can use that list to plan password guessing or social engineering. The service is rarely exposed today, so business risk is low unless a legacy system still runs it on the network.
Executive priority
Low priority for most organizations. Treat as a hygiene item during legacy system reviews or attack surface reduction; no emergency action indicated by the sources.
Technical view
Per the source bundle, cfingerd enumerates all local users when queried with a wildcard pattern such as search.**@target, leaking the account namespace over the finger protocol (TCP/79). No CVSS, CWE, or affected version data is provided in the record, and the only reference is an X-Force entry. This is an information disclosure weakness that undermines account confidentiality but does not itself grant code execution or authentication bypass.
Likely exposure
Exposure is limited to hosts still running cfingerd with the finger port reachable from untrusted networks. Modern enterprises rarely deploy finger, but the risk persists on legacy Unix systems, research hosts, or forgotten appliances retained for backwards compatibility.
Exploitation context
Not listed in CISA KEV and no cited source claims active exploitation. The technique is trivial and publicly documented as a reconnaissance aid, so opportunistic use against exposed finger daemons should be assumed wherever the service is still running.
Researcher notes
The CVE record contains no affected vendor, version, CVSS, or CWE metadata, and cites only an X-Force reference. Confidence in scope is limited by that gap. Analysts should treat this as a historical information-disclosure issue in cfingerd and confirm the specific build in use before assuming presence or absence of the flaw.
Mitigation direction
- Disable the finger service on internet-facing and internal hosts unless there is a documented business need.
- Block inbound TCP/79 at perimeter and host firewalls.
- If cfingerd must remain, consult vendor or distribution guidance for a fixed build or restrictive configuration.
- Restrict finger responses to authenticated or allow-listed sources only.
Validation and detection
- Inventory hosts for cfingerd or any finger daemon listening on TCP/79.
- From an authorized test host, query the finger service with a benign user string and confirm it does not return full user rosters.
- Review firewall and network ACLs to confirm TCP/79 is denied from untrusted zones.
- Check vendor advisories and the referenced X-Force entry for any named fixed version relevant to the deployed build.
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-1999-0259 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://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0259CVE 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.