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CVE Record

CVE-2020-3558: Cisco Firepower Management Center Software Open Redirect Vulnerability

A vulnerability in the web-based management interface of Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. The vulnerability is due to improper input validation of the parameters of an HTTP request. An attacker could exploit this vulnerability by intercepting an HTTP request from a user. A successful exploit could allow the attacker to modify the HTTP request to cause the interface to redirect the user to a specific, malicious URL. This type of vulnerability is known as an open redirect attack and is used in phishing attacks that get users to unknowingly visit malicious sites.

MediumCVSS 4.7Not KEV-listedUpdated
Glexia's TakeAutomated analysismoderate

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.
Prepared
Confidence
high
Sources
3

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

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 lookup
cve · low confidence lookup

CVE-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
Vulnerability profileCVE Program record
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

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
4.7CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N2.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.7Medium
CVSS 3.1 vector shape for CVE-2020-3558Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Firepower Management Centern/aListed
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-601 · source CWE mapping

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.