Security readout for executives and security teams
Plain-English summary
CVE-2020-3176 is a command injection flaw in Cisco Remote PHY Device Software. A local administrator can pass crafted CLI arguments that the device fails to sanitize, allowing Linux shell commands to run as root. This is not an internet drive-by issue, but it can turn an already privileged device login into full device compromise.
Executive priority
Treat this as a targeted infrastructure risk, not a mass internet emergency. Prioritize remediation where Cisco Remote PHY devices support critical cable or network operations, where administrator access is broadly shared, or where management access is weakly segmented.
Technical view
The flaw is CWE-77 improper neutralization of command elements. Cisco describes exploitation through certain CLI commands with crafted arguments by an authenticated local attacker with valid administrator access. CVSS 3.0 is 6.7 with local attack vector, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to organizations operating affected Cisco Remote PHY Device Software where administrator CLI access is available. The source bundle does not identify exact affected versions, exposed services, or deployment counts, so inventory validation against Cisco guidance is required.
Exploitation context
The source bundle does not report active exploitation, and the CVE is not marked as CISA KEV. Exploitation requires valid administrator access and local interaction with affected device CLI functionality, reducing broad external risk but increasing concern for insider abuse or compromised admin accounts.
Researcher notes
Key evidence gaps are exact affected versions, fixed releases, and any named workaround in the provided bundle. The vulnerability’s practical severity depends on local administrative access controls, device role criticality, and whether Cisco’s advisory identifies supported fixed software.
Mitigation direction
- Check Cisco’s advisory for affected releases, fixed software, and official workarounds.
- Inventory Cisco Remote PHY deployments and confirm software versions against vendor guidance.
- Restrict administrator and local CLI access to trusted personnel and management networks.
- Review privileged account hygiene, MFA coverage, and credential rotation for device administrators.
- Monitor device administrative activity for unexpected CLI use or configuration changes.
Validation and detection
- Confirm whether Cisco Remote PHY Device Software exists in the environment.
- Map device software versions to Cisco’s advisory before prioritizing remediation.
- Review administrator access paths and identify who can reach local CLI functions.
- Check logs for unusual privileged administrative sessions or unexplained device changes.
- Document whether the device is patched, mitigated, or accepted as a known risk.
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-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupCVE-2020-3176 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
- 6.7 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/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:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H0.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.7MediumVector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200304 Cisco Remote PHY Device Software Command Injection 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 Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.