Security readout for executives and security teams
Plain-English summary
CVE-2021-1500 is an open redirect in Cisco Webex Video Mesh’s web management interface. If a user clicks a crafted link, they can be sent to a malicious site that appears connected to trusted Webex infrastructure. The main business risk is phishing support, not direct system takeover.
Executive priority
Treat as a moderate-priority phishing enabler. It should be tracked and remediated during normal vulnerability cycles, with faster action if Webex Video Mesh is internet-reachable or heavily used by privileged administrators.
Technical view
The issue is CWE-601 caused by improper URL parameter validation in HTTP requests to the web-based management interface. It is remotely reachable without authentication but requires user interaction. CVSS 3.1 is 5.4, with limited confidentiality and integrity impact and no availability impact.
Likely exposure
Organizations operating Cisco Webex Video Mesh are potentially exposed. The provided record does not name affected or fixed versions, so exposure must be validated against Cisco’s advisory and deployed Video Mesh inventory.
Exploitation context
The source bundle reports no CISA KEV listing and provides no evidence of active exploitation. Exploitation requires persuading a user to open a crafted link, making it most relevant as part of phishing or social engineering activity.
Researcher notes
Evidence is limited to the CVE record and Cisco advisory reference. Affected versions are not specified in the provided bundle. Do not assume exploit activity, patch levels, or appliance scope beyond Cisco Webex Video Mesh.
Mitigation direction
- Check Cisco’s advisory for fixed software or official mitigation guidance.
- Inventory Cisco Webex Video Mesh deployments and management interfaces.
- Apply Cisco-recommended updates when the applicable version is confirmed.
- Limit management interface exposure where operationally feasible.
- Reinforce phishing defenses for links referencing Webex infrastructure.
Validation and detection
- Confirm whether Cisco Webex Video Mesh is deployed in the environment.
- Compare deployed versions against Cisco’s advisory guidance.
- Review web management access paths and user groups with access.
- Check security monitoring for suspicious Webex-themed redirection or phishing reports.
- Document whether compensating controls reduce user exposure.
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-601: 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-2021-1500 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
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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:U/C:L/I:L/A:N2.82.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20211103 Cisco Webex Video Mesh Arbitrary Site Redirection 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.
URL Redirection to Untrusted Site ('Open Redirect')
URL Redirection to Untrusted Site ('Open Redirect') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
