Security readout for executives and security teams
Plain-English summary
CVE-2021-1525 lets an unauthenticated attacker lure a Webex user to a crafted URL that makes the Webex interface offer a remote file. The main business risk is trust abuse: users may believe a malicious file or prompt is legitimate because it appears through Webex.
Executive priority
Treat this as a moderate-priority phishing-enablement issue, not a direct system compromise. Remediate through vendor guidance and user-risk controls, with priority where Webex is widely trusted for external collaboration.
Technical view
Cisco attributes the issue to improper validation of URL paths in Cisco Webex Meetings and Webex Meetings Server. It is classified as CWE-601 with CVSS 3.1 score 4.7. Attack complexity is low, no privileges are required, but user interaction is required and impact is limited to integrity.
Likely exposure
Exposure is most relevant for organizations using Cisco Webex Meetings or Cisco Webex Meetings Server, especially where users receive meeting links from external parties. The source bundle does not identify specific affected versions.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Exploitation requires persuading a user to follow a crafted URL. A successful attack could support phishing or spoofing by causing Webex to present a remote file.
Researcher notes
The evidence supports a URL-path validation flaw leading to remote file presentation in the Webex UI. Public bundle details do not include exploit code, affected version ranges, fixed versions, or confirmed exploitation, so validation should stay advisory-driven.
Mitigation direction
- Review Cisco's advisory for affected releases and fixed-version guidance.
- Prioritize updates for internet-facing or broadly used Webex environments.
- Warn users about unexpected Webex links and file prompts.
- Monitor helpdesk and security reports for suspicious Webex-themed phishing.
Validation and detection
- Inventory Cisco Webex Meetings and Webex Meetings Server usage.
- Compare deployed versions and service status against Cisco advisory guidance.
- Review web, proxy, and email telemetry for suspicious Webex URLs.
- Confirm phishing reporting paths cover Webex link and file-prompt abuse.
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-2021-1525 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
- 4.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/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:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.7MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210602 Cisco Webex Meetings and Webex Meetings Server File Redirect 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.