Security readout for executives and security teams
Plain-English summary
This flaw could let an outside attacker trick an administrator into clicking a malicious link, causing Cisco Firepower Chassis Manager to perform actions as that administrator. The business risk is unauthorized device management activity, not direct exploitation without user interaction.
Executive priority
Treat as high priority for Cisco management-plane environments. It can affect confidentiality, integrity, and availability if an administrator is tricked, but current provided evidence does not support emergency active-exploitation handling.
Technical view
CVE-2020-3456 is a CSRF issue in Cisco Firepower Chassis Manager within Cisco FXOS Software. Insufficient CSRF protection lets an unauthenticated remote attacker send arbitrary requests through a targeted user's browser after persuading them to click a malicious link. CVSS 3.1 is 8.8 high.
Likely exposure
Exposure is most likely where Cisco FXOS Firepower Chassis Manager is used by administrators. The provided affected-product data is incomplete or inconsistent because it lists Cisco ASA Software while the title and description identify FXOS FCM.
Exploitation context
The bundle does not show CISA KEV listing or other evidence of active exploitation. Exploitation requires user interaction: the attacker must persuade a targeted user to click a malicious link, then requests may run with that user's authority.
Researcher notes
The key uncertainty is product scope. The source bundle names FXOS FCM, but the affected entry lists Cisco ASA Software with no versions. Validate scope against the Cisco advisory before making remediation decisions.
Mitigation direction
- Check Cisco's advisory for fixed releases, workarounds, and affected version details.
- Prioritize updates for systems where administrators use Firepower Chassis Manager.
- Restrict Firepower Chassis Manager access to trusted administration networks where feasible.
- Warn administrators not to open untrusted links during active management sessions.
- Review vendor guidance before deploying any operational workaround.
Validation and detection
- Inventory Cisco FXOS deployments that use Firepower Chassis Manager.
- Compare deployed versions and platforms against Cisco's advisory.
- Confirm whether FCM is reachable from untrusted networks or user workstations.
- Review change logs for unexplained FCM actions around suspicious link activity.
- Document any compensating controls limiting administrator browser exposure.
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-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2020-3456 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20201021 Cisco FXOS Software Firepower Chassis Manager Cross-Site Request Forgery 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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.