Security readout for executives and security teams
This flaw can let an unauthenticated remote attacker make Cisco Prime Access Registrar restart by exhausting file descriptions through mishandled TCP SYN traffic. The business impact is service interruption, not data theft or code execution based on the provided sources. Exposure is most relevant where Cisco Prime Access Registrar is deployed and its affected listening ports are reachable from untrusted or broad networks. The provided bundle does not identify affected versions or exact ports. Treat as a service availability risk for environments relying on Cisco Prime Access Registrar. Prioritize review if the service supports authentication, remote access, or customer-facing connectivity, especially where exposed beyond trusted networks. Mitigation focus: Review Cisco advisory for affected releases, fixed versions, and official workarounds.; Inventory Cisco Prime Access Registrar deployments and ownership.; Restrict untrusted network reachability to Prime Access Registrar listening ports where feasible..
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-399: 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-2018-0421 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
- 20180905 Cisco Prime Access Registrar Denial of Service VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
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.
Resource Management Errors
Resource Management Errors represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.