Security readout for executives and security teams
Plain-English summary
CVE-2021-40115 is a medium-severity cross-site scripting issue in Cisco Webex Video Mesh. An attacker would need to trick a user into clicking a crafted link. If successful, the attacker could run script in the management interface context or access sensitive browser-based information.
Executive priority
Treat this as a moderate-priority remediation item for environments running Cisco Webex Video Mesh. It is not presented as actively exploited, but it can affect administrative browser sessions and should be addressed through vendor guidance.
Technical view
The issue is CWE-79 in the Cisco Webex Video Mesh web-based management interface. Cisco attributes it to insufficient validation of user-supplied input. CVSS 3.1 is 6.1, with network attack vector, low complexity, no privileges required, required user interaction, changed scope, and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to organizations using Cisco Webex Video Mesh. The supplied sources do not identify specific affected versions, deployment modes, or public internet exposure assumptions.
Exploitation context
The supplied sources do not show known active exploitation, and the CVE is not marked KEV. Exploitation requires persuading a user to click a crafted link.
Researcher notes
Evidence is sparse in the supplied bundle beyond Cisco's advisory summary, CVSS vector, CWE-79 classification, and affected product name. Do not infer vulnerable versions, exploit availability, or patch details without consulting Cisco's advisory directly.
Mitigation direction
- Review Cisco's advisory for affected releases and official remediation.
- Apply Cisco-recommended updates or workarounds where applicable.
- Restrict management interface access to trusted administrative networks.
- Warn administrators against unexpected Webex Video Mesh management links.
- Monitor browser and management-interface activity for suspicious access patterns.
Validation and detection
- Inventory Cisco Webex Video Mesh deployments.
- Confirm management interface exposure and administrative access paths.
- Compare installed versions against Cisco's advisory guidance.
- Check whether vendor-recommended remediation has been applied.
- Review logs for unusual management-interface activity around user sessions.
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-2021-40115 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
- 20211103 Cisco Webex Video Mesh 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.
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.