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TI-2021-01038 Aliases CVE-2021-1311GHSA-g93r-rwcj-f35x

Cisco Webex Meetings and Cisco Webex Meetings Server Host Key Brute Forcing Vulnerability

Priority LOW 27CWE-307Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-307.

Summary

A vulnerability in the reclaim host role feature of Cisco Webex Meetings and Cisco Webex Meetings Server could allow an authenticated, remote attacker to take over the host role during a meeting. This vulnerability is due to a lack of protection against brute forcing of the host key. An attacker could exploit this vulnerability by sending crafted requests to a vulnerable Cisco Webex Meetings or Webex Meetings Server site. A successful exploit would require the attacker to have access to join a Webex meeting, including applicable meeting join links and passwords. A successful exploit could allow the attacker to acquire or take over the host role for a meeting.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01279 70th 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

VendorProductAffected versionsFixed inStatusSource
CiscoCisco WebEx Meetings Serverall versions—No fix listedCNA
  • Cisco WebEx Meetings Server VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 11

CPEVersionsRoleVendor
cpe:2.3:a:cisco:webex_meetings:*:*:*:*:*:*:*:*before 40.12.0VulnerableCisco
cpe:2.3:a:cisco:webex_meetings_server:*:*:*:*:*:*:*:*before 3.0VulnerableCisco
cpe:2.3:a:cisco:webex_meetings_server:3.0:-:*:*:*:*:*:*3.0VulnerableCisco
cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release1:*:*:*:*:*:*3.0 maintenance_release1VulnerableCisco
cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release2:*:*:*:*:*:*3.0 maintenance_release2VulnerableCisco
cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release3:*:*:*:*:*:*3.0 maintenance_release3VulnerableCisco
cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release4:*:*:*:*:*:*3.0 maintenance_release4VulnerableCisco
cpe:2.3:a:cisco:webex_meetings_server:4.0:-:*:*:*:*:*:*4.0VulnerableCisco
cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release1:*:*:*:*:*:*4.0 maintenance_release1VulnerableCisco
cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release2:*:*:*:*:*:*4.0 maintenance_release2VulnerableCisco
  • cpe:2.3:a:cisco:webex_meetings:*:*:*:*:*:*:*:* Versions before 40.12.0 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:3.0:maintenance_release4:*:*:*:*:*:* Versions 3.0 maintenance_release4 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
Show 1 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release3:*:*:*:*:*:*4.0 maintenance_release3VulnerableCisco
  • cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release3:*:*:*:*:*:* Versions 4.0 maintenance_release3 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-1311
  2. 2026-10-03 Alias added: GHSA-g93r-rwcj-f35x

References

Advisory 1

  • TI-2019-01300 Cisco Webex Meetings Desktop App and Cisco Webex Productivity Tools Update Service Command Injection Vulnerability CVSS 3.0HIGH 8.8
  • TI-2018-00079 Improper input validation in Cisco WebEx Advanced Recording Format Player CVSS 3.0CRITICAL 9.6
  • TI-2018-00224 Improper input validation in Cisco WebEx Advanced Recording Format file players CVSS 3.0CRITICAL 9.6
  • TI-2020-02913 Cisco Webex Meetings and Cisco Webex Meetings Server Token Handling Unauthorized Access Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2020-02894 Cisco Webex Meetings Desktop App for Mac Update Feature Code Execution Vulnerability CVSS 3.1HIGH 8.8
  • TI-2017-09144 Memory corruption in Cisco WebEx Recording Format and Advanced Recording Format Players CVSS 3.0CRITICAL 9.6
See all 68 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences