Security readout for executives and security teams
Plain-English summary
This entry describes a configuration condition rather than a software flaw: a system's network interface is running in "promiscuous" mode, which lets it capture all traffic on the local network segment instead of only traffic addressed to it. On its own that setting is not a hacker exploit, but on a general-purpose server it can signal an installed sniffer or an insider gathering credentials and sensitive data in transit.
Executive priority
Low priority. Treat as a hygiene and detection issue, not an emergency patch. Fold into standard configuration-management and insider-threat programs; escalate only if a promiscuous interface is found on a host that should not have one, which may indicate a prior compromise worth investigating.
Technical view
CVE-1999-0530 is a legacy CVE describing the presence of a network interface configured in promiscuous mode, enabling packet capture of all frames on the attached broadcast domain. The record identifies no vendor, product, CVSS score, or CWE mapping and links only to an X-Force reference. It is a policy/hygiene finding: promiscuous mode is a legitimate mode used by IDS sensors, hypervisors, and troubleshooting tools, but on hosts without that role it may indicate unauthorized sniffing following a compromise or insider misuse.
Likely exposure
Exposure is limited to hosts sharing a Layer 2 segment with the sniffing interface. Modern switched networks, VLAN segmentation, and pervasive TLS greatly reduce impact compared with 1999-era shared-media LANs. Highest residual risk is in flat internal segments, lab networks, and virtualization hosts where cleartext protocols (SNMPv1/2c, legacy management, unencrypted internal APIs) still traverse the wire.
Exploitation context
Not tracked in CISA KEV and no cited source reports active exploitation. This CVE describes a state, not a remotely exploitable vulnerability; there is no CVSS score and no patch to apply. Risk is realized only when an attacker or insider has already gained sufficient host privileges to enable promiscuous mode or attach a sniffer, so it is more useful as a detection signal than a patch-management item.
Researcher notes
Legacy 1999 CVE with no vendor, product, CVSS, CWE, or KEV entry — effectively a configuration-audit signature rather than a software vulnerability. Useful as a control mapped to insider-threat and post-compromise detection use cases. When triaging, focus on whether the host's role justifies promiscuous mode and whether nearby traffic still exposes cleartext credentials or session tokens; the CVE itself has no fix to track.
Mitigation direction
- Restrict promiscuous mode to sanctioned IDS, hypervisor, and troubleshooting hosts through hardening baselines.
- Enforce switched networks with VLAN segmentation and disable unused span/mirror ports.
- Require encryption (TLS, SSH, IPsec) for management and application traffic on internal segments.
- Alert on unexpected interface state changes to promiscuous mode via EDR or host telemetry.
- Rotate credentials and review host integrity if an unauthorized sniffer is confirmed.
Validation and detection
- Inventory hosts and check interface flags (e.g., ip link, ifconfig, Get-NetAdapter) for PROMISC state.
- Correlate promiscuous interfaces with approved roles such as IDS, packet broker, or hypervisor.
- Review EDR and auth logs for unexpected sniffer installs or privilege escalations preceding the state change.
- Confirm switch port security and monitor session configurations on connected switches.
- Sample internal traffic to verify sensitive protocols are encrypted end-to-end.
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-1999-0530 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/778CVE 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.