Security readout for executives and security teams
Plain-English summary
CVE-2021-35199 is a stored cross-site scripting issue in NETSCOUT nGeniusONE 6.3.0 build 1196 and earlier. If abused, attacker-supplied content could be saved through UploadFile and later run in another user’s browser. Public sources do not provide severity, exploit status, or a fixed version.
Executive priority
Treat this as an inventory and vendor-guidance priority, not an emergency based on current public evidence. Escalate if affected nGeniusONE consoles are externally reachable, widely accessible internally, or used by privileged operators.
Technical view
The record describes stored XSS in the UploadFile functionality of NETSCOUT nGeniusONE 6.3.0 build 1196 and earlier. The available bundle does not describe required privileges, attack vector, affected parameters, CVSS, CWE, proof-of-concept details, or remediation version.
Likely exposure
Exposure is most likely where NETSCOUT nGeniusONE 6.3.0 build 1196 or earlier is deployed and UploadFile is reachable by users or administrators. Risk is higher for internet-accessible consoles or broad internal access.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Stored XSS generally requires a way to submit stored content and a victim user viewing the affected application area, but source details are incomplete.
Researcher notes
The public record is sparse. Avoid assuming affected parameters, authentication requirements, or patch versions from the CVE text alone. Research should start by correlating the NETSCOUT advisory with deployed build numbers and access paths.
Mitigation direction
- Check NETSCOUT security advisories for the supported fix or upgrade path.
- Limit nGeniusONE administrative access to trusted networks and users.
- Restrict UploadFile access to roles with a clear operational need.
- Review and remove suspicious uploaded or stored content if found.
- Apply browser/session hardening controls where available.
Validation and detection
- Inventory nGeniusONE deployments and confirm exact build numbers.
- Identify any systems running 6.3.0 build 1196 or earlier.
- Confirm whether UploadFile is reachable from untrusted networks or users.
- Review NETSCOUT advisory guidance for fixed versions or workarounds.
- Check application logs for unusual upload activity around affected systems.
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.
CVE-2021-35199 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.netscout.com/securityadvisoriesCVE reference · x_refsource_MISC
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.