Security readout for executives and security teams
Plain-English summary
A FreeBSD regression could cause login access rules to fail to match. If an organization relied on login.access rules to deny certain users or origins, those denials could be ignored, allowing access that policy intended to block.
Executive priority
Prioritize systems where login.access rules protect privileged, administrative, or remote access. Treat as a policy-enforcement failure requiring timely patching, especially on internet-reachable or multi-user FreeBSD systems.
Technical view
CVE-2020-25580 affects FreeBSD 12.2-STABLE before r369346, 11.4-STABLE before r369345, 12.2-RELEASE before p4, and 11.4-RELEASE before p8. The issue is in the login.access(5) rule processor used by pam_login_access, where deny rules may not match as expected.
Likely exposure
Exposure is most likely on affected FreeBSD 11.4 or 12.2 systems that use login.access or pam_login_access deny rules for access control. Systems not relying on those rules have lower practical exposure.
Exploitation context
The supplied sources do not show CISA KEV listing or active exploitation. The risk is access policy bypass, not documented code execution. Business impact depends on whether denied users or sources would otherwise have valid authentication paths.
Researcher notes
Evidence is limited to the CVE description and vendor advisory references. No CVSS, CWE, or exploit evidence is supplied. Validation should focus on configuration dependence and fixed FreeBSD patch levels rather than assumed universal exploitability.
Mitigation direction
- Upgrade FreeBSD 12.2-RELEASE to p4 or later.
- Upgrade FreeBSD 11.4-RELEASE to p8 or later.
- For STABLE branches, update beyond r369346 or r369345 as applicable.
- Review the FreeBSD advisory before deploying changes.
- Check the NetApp advisory for product-specific guidance where relevant.
Validation and detection
- Inventory FreeBSD 11.4 and 12.2 systems.
- Confirm installed patch level or STABLE revision.
- Identify hosts using login.access or pam_login_access.
- Review deny rules that enforce administrative or source-based restrictions.
- Verify intended denied access remains blocked after remediation.
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-2020-25580 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://security.freebsd.org/advisories/FreeBSD-SA-21:03.pam_login_access.ascCVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210423-0005/CVE reference · x_refsource_CONFIRM
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.