Security readout for executives and security teams
Plain-English summary
CVE-2020-3558 is an open redirect issue in Cisco Firepower Management Center's web management interface. An attacker could manipulate a user's request so the interface sends them to a malicious site. The main business risk is phishing and trust abuse, not direct system takeover.
Executive priority
Handle this as a moderate-priority phishing-enablement issue. It should be included in routine Cisco FMC patch and exposure review, especially where administrators manage high-value security infrastructure through the web interface.
Technical view
The issue is improper input validation of HTTP request parameters in Cisco FMC Software. It is unauthenticated and network-reachable, but requires user interaction. CVSS 3.1 is 4.7 with changed scope and low integrity impact. The weakness is CWE-601 open redirect.
Likely exposure
Exposure is limited to organizations running Cisco Firepower Management Center Software. Risk increases when administrators access FMC through reachable web management interfaces and may trust links associated with that interface.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. The described attack requires a user to interact with a modified request and is mainly useful for phishing or redirecting users to malicious pages.
Researcher notes
Evidence identifies the class, vector, product, and CVSS, but the bundle does not include affected version ranges or fixed release details. Avoid assuming exploit activity or specific remediation beyond Cisco's published guidance.
Mitigation direction
- Review Cisco's advisory for affected and fixed release guidance.
- Inventory Cisco FMC deployments and identify exposed management interfaces.
- Apply Cisco-supported updates or mitigations where the advisory specifies them.
- Treat unexpected FMC-linked redirects as phishing indicators.
- Limit FMC management access to trusted administrative paths where feasible.
Validation and detection
- Confirm whether Cisco Firepower Management Center Software is deployed.
- Compare deployed FMC versions against Cisco's advisory details.
- Review web access logs for unusual redirect-related activity.
- Verify administrators know not to trust unexpected FMC redirect links.
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-601: 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-2020-3558 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
- 4.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
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:C/C:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.7MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20201021 Cisco Firepower Management Center Software Open Redirect 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.
URL Redirection to Untrusted Site ('Open Redirect')
URL Redirection to Untrusted Site ('Open Redirect') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
