Security readout for executives and security teams
Plain-English summary
CVE-2020-25673 is a Linux kernel availability flaw. A non-blocking socket path in llcp_sock_connect() can leak resources and eventually hang the system. The public record does not provide a CVSS score, confirmed exploit activity, or a complete fixed-version list.
Executive priority
Treat as an availability risk for Linux systems, not as confirmed active exploitation. Prioritize patch verification for systems where outages are costly and where NFC-related kernel functionality may be enabled.
Technical view
The issue is described in the Linux kernel NFC LLCP socket area: non-blocking use of llcp_sock_connect() can cause a resource leak, mapped to CWE-400. The reported impact is system hang, indicating denial of service rather than data theft or code execution based on the provided sources.
Likely exposure
Linux systems are relevant, especially where kernel NFC socket functionality is present or enabled. The source bundle says “Linux Kernel” broadly, but does not define distributions, kernel versions, configurations, or whether remote exposure is possible.
Exploitation context
No source in the bundle reports active exploitation, and CISA KEV is false. The available evidence supports denial-of-service risk from resource exhaustion, but not exploit maturity, attacker prerequisites, or remote reachability.
Researcher notes
Evidence is limited to a concise CVE description and linked advisories. Avoid assuming remote exploitability, privilege requirements, or affected version ranges without vendor-specific data. Focus validation on kernel NFC LLCP socket exposure and vendor package status.
Mitigation direction
- Check Linux distribution and vendor advisories for fixed kernel packages.
- Prioritize kernel updates on systems using or exposing NFC functionality.
- Review Fedora advisories for applicable package updates if running Fedora.
- Review NetApp advisory applicability for affected NetApp-managed environments.
- Where operationally feasible, disable unused NFC functionality pending vendor guidance.
Validation and detection
- Inventory Linux kernels and distributions across managed assets.
- Identify systems with NFC support, modules, or related workloads enabled.
- Compare installed kernel packages against vendor advisory guidance.
- Check vendor advisories for fixed package names and affected configurations.
- Monitor affected systems for unexplained hangs or resource exhaustion symptoms.
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.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-25673 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
- FEDORA-2021-1c170a7c7cCVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-21360476b6CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-d56567bdabCVE reference · vendor-advisory, x_refsource_FEDORA
- https://www.openwall.com/lists/oss-security/2020/11/01/1CVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210702-0008/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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.