Security readout for executives and security teams
Plain-English summary
Cisco ISE has a medium-severity web management interface XSS issue. An attacker does not need an account, but must convince an interface user to click a crafted link. Success could run script in that user's browser context and expose browser-accessible information.
Executive priority
Treat this as moderate priority. It is not a wormable infrastructure takeover, but Cisco ISE is security-critical, and successful XSS against administrators can affect trust in identity and network access operations.
Technical view
CVE-2020-3551 is CWE-79 in Cisco Identity Services Engine Software's web-based management interface. The issue is improper validation of user-supplied input. CVSS 3.1 is 6.1: network exploitable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is likely limited to organizations running Cisco Identity Services Engine Software with users who access its web management interface. The source bundle does not identify affected or fixed versions, so version-specific exposure must be confirmed against Cisco's advisory.
Exploitation context
The provided sources do not show known active exploitation, and the CVE is not listed as KEV. Exploitation requires social engineering an interface user into clicking a crafted link, then executing script in the affected interface context.
Researcher notes
Key constraints are unauthenticated attacker, required user interaction, and browser-context impact. The bundle lacks affected-version and fixed-version detail, so researchers should avoid overclaiming scope and should anchor validation to Cisco advisory data.
Mitigation direction
- Review Cisco's advisory for affected releases and fixed software guidance.
- Upgrade or patch affected Cisco ISE deployments according to Cisco guidance.
- Limit web management interface access to trusted administrative networks where feasible.
- Warn ISE administrators not to follow unexpected management-interface links.
- Monitor Cisco updates if version or remediation details remain unclear.
Validation and detection
- Inventory Cisco ISE Software deployments and their management interface exposure.
- Compare installed versions with Cisco's advisory for affected and fixed releases.
- Confirm who has access to the ISE web management interface.
- Review proxy, email, and browser telemetry for suspicious ISE-related links.
- Avoid validation methods that require clicking untrusted crafted 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-79: 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-2020-3551 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20201104 Cisco Identity Services Engine Cross-Site Scripting 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.