Security readout for executives and security teams
Plain-English summary
Cisco ISE had stored XSS flaws in its web management interface. An attacker already holding administrative credentials could place malicious script into interface content, affecting another user who later views it. Business urgency is moderate: the prerequisite admin access limits broad exposure, but Cisco ISE is security infrastructure, so compromise of admin sessions matters.
Executive priority
Treat as a moderate-priority security infrastructure issue. It is not described as actively exploited, but Cisco ISE controls identity and network access decisions, so vulnerable management interfaces should be verified and remediated in the normal patch cycle.
Technical view
CVE-2020-3340 is CWE-79 stored XSS in Cisco Identity Services Engine Software. The issue comes from insufficient validation of user-supplied input processed by the web management interface. CVSS 3.0 is 4.8, with network access, low complexity, high privileges required, user interaction required, changed scope, and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to Cisco ISE Software deployments with vulnerable web-based management interfaces. The provided bundle does not identify exact affected versions. Risk is mainly inside administrative workflows because exploitation requires valid administrative credentials and a victim using the interface.
Exploitation context
The source bundle does not report active exploitation, and KEV status is false. Exploitation requires an authenticated remote attacker with administrative credentials and a user interaction condition. Successful exploitation could run script in the interface context or access sensitive browser-based information.
Researcher notes
The key constraints are PR:H and UI:R. This is stored XSS with changed scope but only low confidentiality and integrity impact and no availability impact. The bundle does not provide affected version ranges, fixed versions, or page-level details, so validation should rely on Cisco’s advisory.
Mitigation direction
- Review Cisco’s advisory for applicable fixed releases and upgrade guidance.
- Restrict Cisco ISE management interface access to trusted admin networks.
- Enforce strong administrative account controls, MFA, and least privilege.
- Review administrative accounts for unnecessary or stale privileges.
- Monitor Cisco ISE administrative activity for suspicious interface changes.
Validation and detection
- Inventory all Cisco ISE Software deployments and exposed management interfaces.
- Compare installed versions against Cisco’s advisory because versions are not listed in the bundle.
- Confirm admin access is restricted to approved users and networks.
- Review recent ISE admin changes for unexpected script-like content.
- Check logs for unusual administrative activity around management interface pages.
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-2020-3340 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
- 4.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:H/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:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N1.72.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.8MediumVector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20200701 Cisco Identity Services Engine Stored Cross-Site Scripting VulnerabilitiesCVE 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.
