Security readout for executives and security teams
Plain-English summary
This flaw lets someone who already has local authenticated access to Cisco FXOS on Firepower 4100/9300 appliances run operating-system commands as root. It is not described as remotely exploitable, but it can turn a privileged device login into full control of the underlying system.
Executive priority
Treat this as a controlled but important appliance-hardening issue. Prioritize environments where many administrators have CLI access, privileged credentials are shared, or Firepower appliances protect sensitive network segments.
Technical view
CVE-2020-3459 is a CWE-78 command injection issue in the Cisco FXOS CLI for Firepower 4100/9300 Series. Cisco attributes it to insufficient input validation. Exploitation requires authenticated local access and high privileges, with no user interaction, and can execute commands as root. CVSS v3.0 score is 6.7.
Likely exposure
Exposure is most likely in environments running Cisco Firepower 4100 or 9300 Series appliances with FXOS and local CLI access enabled for administrators or operators. The bundle does not provide exact affected or fixed version ranges.
Exploitation context
The source bundle does not report active exploitation, and KEV status is false. Practical risk centers on malicious insiders, compromised privileged accounts, or post-authentication activity on security appliances, rather than broad unauthenticated internet exploitation.
Researcher notes
The available bundle supports root-impact command injection after authenticated local CLI access, but does not include precise version ranges, fixed releases, or affected command details. Avoid assuming broader product impact without Cisco advisory confirmation.
Mitigation direction
- Check the Cisco advisory for affected and fixed FXOS releases.
- If applicable, update FXOS according to Cisco’s documented guidance.
- Restrict local CLI access to trusted administrators only.
- Remove unnecessary privileged accounts from affected appliances.
- Monitor appliance administration logs for suspicious CLI activity.
Validation and detection
- Inventory Firepower 4100/9300 appliances and their FXOS versions.
- Compare installed versions against Cisco’s advisory applicability details.
- Review who has local authenticated CLI access.
- Confirm privileged appliance accounts are still required.
- Check logs for unexpected administrative sessions or command 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-78: 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-2020-3459 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
- 20201021 Cisco FXOS Software for Firepower 4100/9300 Series 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.