Security readout for executives and security teams
Plain-English summary
Cisco ISE has multiple web management interface XSS vulnerabilities. An attacker could trick an interface user into interacting with malicious content, potentially exposing limited data or changing limited interface state. The record rates this medium, and no KEV listing is provided.
Executive priority
Treat as a moderate-priority remediation item. It is not evidenced as actively exploited here, but Cisco ISE is security infrastructure, so reduce management-plane exposure and follow Cisco guidance promptly.
Technical view
CVE-2021-34738 covers multiple CWE-79 cross-site scripting flaws in Cisco Identity Services Engine Software's web-based management interface. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges, user interaction required, scope changed, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is likely limited to organizations running Cisco ISE Software, especially where the management interface is reachable by users who can be targeted. The source bundle does not provide affected or fixed version ranges.
Exploitation context
The provided sources do not indicate active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation requires user interaction, consistent with XSS risk against a management interface user.
Researcher notes
Key evidence gaps are version specificity, fixed releases, and technical details beyond XSS in the management interface. Avoid assuming exploitability beyond the CVSS vector and Cisco/CVE description.
Mitigation direction
- Review Cisco's advisory for affected and fixed release guidance.
- Prioritize updates according to Cisco's official remediation instructions.
- Restrict ISE management interface access to trusted administrative networks.
- Reinforce phishing-resistant workflows for administrators using ISE.
Validation and detection
- Inventory Cisco ISE deployments and exact software versions.
- Check Cisco's advisory for whether each version is affected.
- Confirm management interfaces are not broadly internet-accessible.
- Review web access logs for suspicious management interface activity.
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-2021-34738 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
- 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
- 20211020 Cisco Identity Services Engine 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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.