Security readout for executives and security teams
Plain-English summary
This is an old FreeBSD TCP Wrappers issue affecting FreeBSD 4.1.1 through 4.3 when the PARANOID access-control option is enabled. A remote attacker could spoof DNS behavior to bypass intended host-based access restrictions. Business urgency is mainly for legacy systems still running these versions or configurations.
Executive priority
Treat as a legacy-risk finding. Prioritize if old FreeBSD systems still protect network services with DNS-based access controls. If no affected versions remain, record as not applicable.
Technical view
TCP Wrappers in FreeBSD 4.1.1 through 4.3 did not properly check reverse DNS lookup results when PARANOID ACL was enabled. The CVE states this could let remote attackers bypass access restrictions through DNS spoofing. The provided sources do not include CVSS, CWE, patch details, or vendor remediation text.
Likely exposure
Exposure appears limited to legacy FreeBSD 4.1.1 through 4.3 systems using tcp_wrappers with the PARANOID ACL option enabled. Modern systems are not identified as affected in the provided sources.
Exploitation context
The CVE describes remote bypass of access restrictions via DNS spoofing. There is no KEV listing and no provided source confirming active exploitation or public exploit use.
Researcher notes
Source data is sparse and historical. The affected range and condition are clear, but severity scoring, affected package metadata, and remediation details are absent from the provided CVE sources.
Mitigation direction
- Identify any FreeBSD 4.1.1 through 4.3 hosts still in service.
- Check whether tcp_wrappers and PARANOID ACL are enabled.
- Consult FreeBSD or vendor guidance for historical fixes or upgrade paths.
- Retire or isolate unsupported legacy FreeBSD systems where possible.
- Avoid relying on reverse DNS for security decisions.
Validation and detection
- Inventory FreeBSD versions across legacy infrastructure.
- Review tcp_wrappers configuration for PARANOID ACL usage.
- Confirm whether host-based access controls depend on DNS lookups.
- Check change records for historical remediation or OS upgrades.
- Document any remaining exposed services protected only by tcp_wrappers.
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-2001-1155 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.