Cisco Webex Meetings and Webex Meetings Server Multimedia Sharing Security Bypass Vulnerability
Priority LOW 24CWE-693Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-693.
Summary
A vulnerability in the multimedia viewer feature of Cisco Webex Meetings and Cisco Webex Meetings Server could allow an authenticated, remote attacker to bypass security protections. This vulnerability is due to unsafe handling of shared content within the multimedia viewer feature. An attacker could exploit this vulnerability by sharing a file through the multimedia viewer feature. A successful exploit could allow the attacker to bypass security protections and prevent warning dialogs from appearing before files are offered to other users.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00825 57th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco WebEx Meetings Server | all versions | — | No fix listed | CNA |
- Cisco WebEx Meetings Server VendorCisco Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 12
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:webex_meetings_online:41.3.5:*:*:*:*:*:*:* | 41.3.5 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:*:*:*:*:*:*:*:* | before 3.0 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:3.0:-:*:*:*:*:*:* | 3.0 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release1:*:*:*:*:*:* | 3.0 maintenance_release1 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release2:*:*:*:*:*:* | 3.0 maintenance_release2 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release3:*:*:*:*:*:* | 3.0 maintenance_release3 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:4.0:-:*:*:*:*:*:* | 4.0 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release1:*:*:*:*:*:* | 4.0 maintenance_release1 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release2:*:*:*:*:*:* | 4.0 maintenance_release2 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release3:*:*:*:*:*:* | 4.0 maintenance_release3 | Vulnerable | Cisco |
- cpe:2.3:a:cisco:webex_meetings_online:41.3.5:*:*:*:*:*:*:* Versions 41.3.5 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:*:*:*:*:*:*:*:* Versions before 3.0 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:3.0:-:*:*:*:*:*:* Versions 3.0 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release1:*:*:*:*:*:* Versions 3.0 maintenance_release1 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release2:*:*:*:*:*:* Versions 3.0 maintenance_release2 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release3:*:*:*:*:*:* Versions 3.0 maintenance_release3 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:4.0:-:*:*:*:*:*:* Versions 4.0 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release1:*:*:*:*:*:* Versions 4.0 maintenance_release1 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release2:*:*:*:*:*:* Versions 4.0 maintenance_release2 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release3:*:*:*:*:*:* Versions 4.0 maintenance_release3 Vulnerable ·Cisco
Show 2 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release3_security_patch3:*:*:*:*:*:* | 4.0 maintenance_release3_security_patch3 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release3_security_patch4:*:*:*:*:*:* | 4.0 maintenance_release3_security_patch4 | Vulnerable | Cisco |
- cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release3_security_patch3:*:*:*:*:*:* Versions 4.0 maintenance_release3_security_patch3 Vulnerable ·Cisco
- cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release3_security_patch4:*:*:*:*:*:* Versions 4.0 maintenance_release3_security_patch4 Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-1517
- 2026-10-03 Alias added: GHSA-6464-c84h-p8px
References
More Cisco Webex Meetings Online vulnerabilities
- TI-2019-01300 Cisco Webex Meetings Desktop App and Cisco Webex Productivity Tools Update Service Command Injection Vulnerability CVSS 3.0HIGH 8.8
- TI-2018-00246 Improper input validation in Cisco WebEx Advanced Recording Format Player CVSS 3.0HIGH 8.8
- TI-2020-02704 Cisco Webex Meetings Suite and Cisco Webex Meetings Online Unauthenticated Meeting Join Vulnerability CVSS 3.1HIGH 7.5
- TI-2020-02689 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulnerabilities CVSS 3.1HIGH 7.8
- TI-2022-05322 Cisco Webex Meetings Java Deserialization Vulnerability CVSS 3.1HIGH 8.8
- TI-2020-02755 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulnerability CVSS 3.1HIGH 7.8
Sources
- CVE-2021-1517 · CVE Program
- CVE-2021-1517 · NVD
- FIRST EPSS
- GHSA-6464-c84h-p8px · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences