Security readout for executives and security teams
Plain-English summary
CVE-2021-1351 is a medium-severity Cisco Webex Meetings web-interface XSS issue. An attacker would need to trick a user into clicking a malicious link. If successful, browser-side script could run in the Webex interface context and potentially access sensitive browser-based information.
Executive priority
Treat this as a moderate business risk. It is not described as actively exploited, but Webex is commonly user-facing and phishing-compatible, so remediation should be tracked through normal vulnerability management rather than deferred indefinitely.
Technical view
The issue is insufficient validation of user-supplied input in Cisco Webex Meetings' web-based interface. It is unauthenticated and remote, but requires user interaction. CVSS 3.1 is 6.1 with low confidentiality and integrity impact and no availability impact.
Likely exposure
Exposure is limited to organizations using Cisco Webex Meetings' web-based interface. The source bundle does not identify affected version ranges, CPEs, or deployment-specific conditions, so teams should verify directly against Cisco guidance.
Exploitation context
The provided data does not show CISA KEV listing or active exploitation. Exploitation requires persuading a user to click a crafted link, making phishing or social-engineering delivery the most relevant context.
Researcher notes
Key constraints are CVSS UI:R and CWE-80. The source bundle names Cisco Webex Meetings but gives versions as n/a. Avoid broad product assumptions and validate only against Cisco's advisory and local asset evidence.
Mitigation direction
- Review Cisco's advisory for fixed software or service guidance for Webex Meetings.
- Apply Cisco-recommended updates or remediation for affected Webex Meetings environments.
- Warn users not to follow unexpected Webex links from untrusted sources.
- Monitor Webex-related browser or session anomalies where logging is available.
Validation and detection
- Inventory Cisco Webex Meetings usage and confirm web-based interface exposure.
- Check Webex versions or service status against Cisco's advisory.
- Review mail and collaboration controls for malicious meeting-link lures.
- Document that sources do not list affected version ranges or CPEs.
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-80: 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-2021-1351 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
- 20210217 Cisco Webex Meetings 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 Script-Related HTML Tags in a Web Page (Basic XSS)
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.