Security readout for executives and security teams
Plain-English summary
CVE-2000-0916 is an old weakness in FreeBSD 4.1.1 and earlier, and possibly other BSD-derived systems. The system may choose predictable TCP connection numbers, allowing a remote attacker to impersonate a trusted connection in some network conditions.
Executive priority
Prioritize if legacy BSD systems still support business services or trusted network access. For modern, supported platforms, urgency is lower unless vendor guidance confirms exposure.
Technical view
The CVE describes insufficient randomness in TCP Initial Sequence Number generation. Predictable ISNs can enable TCP spoofing against services that trust source IP or established TCP state. The record names FreeBSD 4.1.1 and earlier, with possible impact to other BSD-based operating systems, but provides limited affected-product detail.
Likely exposure
Primary exposure is legacy FreeBSD 4.1.1 or earlier systems, especially internet-facing or trust-based network services. The source also says other BSD-based OSes may be affected, but does not identify them.
Exploitation context
No CISA KEV listing or cited source indicates active exploitation. Practical abuse generally depends on network reachability, predictable TCP sequencing, and services that can be abused through spoofed TCP connections.
Researcher notes
The available CVE data is sparse: no CVSS, CWE, vendor advisory, or patch reference is included. Treat product scope beyond FreeBSD 4.1.1 and earlier as unconfirmed unless validated through vendor sources.
Mitigation direction
- Inventory for FreeBSD 4.1.1 or earlier and unsupported BSD-derived systems.
- Check vendor advisories and upgrade guidance for affected legacy systems.
- Retire or isolate obsolete BSD systems where vendor support is unavailable.
- Avoid source-IP-only trust relationships for sensitive services.
Validation and detection
- Confirm operating system and version on BSD-derived assets.
- Identify services relying on source IP or trusted-host authentication.
- Review network exposure of legacy BSD systems.
- Check vendor documentation for TCP ISN fixes or supported upgrade paths.
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-2000-0916 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
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.