Security readout for executives and security teams
Plain-English summary
CVE-2021-1601 affects Cisco Intersight Virtual Appliance. A nearby unauthenticated attacker could reach sensitive internal services through the external management interface and potentially change device configuration. The issue is high severity because compromise could affect confidentiality, integrity, and availability.
Executive priority
Treat as a high-priority infrastructure exposure if Cisco Intersight Virtual Appliance is present. Prioritize scoping and vendor-guided remediation because successful exploitation could permit configuration changes on affected appliances.
Technical view
The vulnerability is caused by insufficient restrictions on IPv4 or IPv6 packets received on the external management interface. It maps to CWE-284 and has CVSS 3.1 score 8.3 with adjacent-network attack vector, no privileges, and no user interaction required.
Likely exposure
Exposure is limited to environments running Cisco Intersight Virtual Appliance. Risk is highest where the external management interface is reachable from untrusted or broadly shared adjacent network segments.
Exploitation context
The source bundle does not identify active exploitation, and KEV status is false. Exploitation is described as requiring an adjacent attacker to send specific traffic to the affected management interface.
Researcher notes
The public summary does not provide exploit details, affected version granularity, or a named fixed release. Validation should focus on product presence, management-interface reachability, IPv4 and IPv6 exposure, and Cisco advisory alignment.
Mitigation direction
- Review Cisco’s advisory for affected releases and vendor-recommended remediation.
- Restrict management interface access to trusted administrative network segments.
- Reduce adjacent network exposure around the external management interface.
- Monitor appliance configuration and management-plane access for unexpected changes.
Validation and detection
- Confirm whether Cisco Intersight Virtual Appliance is deployed.
- Identify interfaces used for external management access.
- Check whether untrusted adjacent networks can reach the management interface.
- Compare appliance status against Cisco advisory guidance.
- Review logs and configuration history for unexpected management-plane activity.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2021-1601 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
- High
- CVSS
- 8.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H2.85.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.3HighVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20210721 Cisco Intersight Virtual Appliance IPv4 and IPv6 Forwarding VulnerabilitiesCVE 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.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.