Security readout for executives and security teams
Plain-English summary
CVE-2020-3602 is a Cisco StarOS CLI flaw affecting Cisco ASR 5000 Series Software. A malicious insider or compromised privileged account could abuse insufficient command validation to gain root-level control. Business impact is serious for affected carrier/network infrastructure, but exploitation requires local authenticated access, high privileges, and knowledge of the cli test-commands password.
Executive priority
Treat as a moderate but operationally important infrastructure risk. It is not described as remotely exploitable or actively exploited, but root compromise of affected routing infrastructure could disrupt service or undermine trust in network operations.
Technical view
The issue is CWE-20 improper input validation in StarOS CLI command handling. Cisco reports crafted CLI commands can allow arbitrary code execution as root on affected ASR 5000 Series devices. CVSS 3.1 is 6.3 with local attack vector, high privileges required, no user interaction, and high integrity and availability impact.
Likely exposure
Exposure is limited to organizations operating Cisco ASR 5000 Series Software with StarOS and allowing privileged local CLI access. Internet-facing exposure is not indicated by the source bundle because the attack vector is local and authenticated.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires valid credentials on an affected device and knowledge of the cli test-commands password, narrowing likely attackers to insiders or already-compromised administrative accounts.
Researcher notes
Evidence supports a local authenticated privilege escalation with root-code-execution impact. The provided bundle does not include fixed version details, workaround specifics, or proof-of-concept status. Do not assume broader Cisco products are affected beyond Cisco ASR 5000 Series Software.
Mitigation direction
- Review Cisco’s advisory for affected releases, fixed software, and official workarounds.
- Inventory Cisco ASR 5000 Series devices running StarOS.
- Restrict CLI access to trusted administrative users only.
- Remove or rotate unnecessary privileged device credentials.
- Review handling of the cli test-commands password.
- Prioritize vendor-recommended updates during the next maintenance window.
Validation and detection
- Confirm whether any Cisco ASR 5000 Series Software is deployed.
- Map deployed StarOS versions against Cisco’s advisory.
- Identify users with local CLI access to affected devices.
- Check whether cli test-commands password access is limited and documented.
- Review device logs for unexpected privileged CLI activity.
- Record KEV status as not listed based on the provided bundle.
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
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CWE-20: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-3602 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
- Medium
- CVSS
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/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:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H0.85.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20201007 Cisco StarOS Privilege Escalation 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.