TI-2020-02979 Aliases CVE-2020-3430 GHSA-hqr6-633p-3x2j

Cisco Jabber for Windows Protocol Handler Command Injection Vulnerability

MEDIUM 47CWE-78Published 2020-09-04 · Updated 2024-11-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

A vulnerability in the application protocol handling features of Cisco Jabber for Windows could allow an unauthenticated, remote attacker to execute arbitrary commands. The vulnerability is due to improper handling of input to the application protocol handlers. An attacker could exploit this vulnerability by convincing a user to click a link within a message sent by email or other messaging platform. A successful exploit could allow the attacker to execute arbitrary commands on a targeted system with the privileges of the user account that is running the Cisco Jabber client software.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.03902 90th 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: Total

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 Jabber	all versions	—	No fix listed	CNA

Cisco Jabber VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cisco:jabber::::::windows::*	12.1 to before 12.1.3; 12.5 to before 12.5.2; 12.6 to before 12.6.3; 12.7 to before 12.7.2; 12.8 to before 12.8.3; 12.9 to before 12.9.1	Vulnerable	Cisco

cpe:2.3:a:cisco:jabber:*:*:*:*:*:windows:*:* Versions 12.1 to before 12.1.3; 12.5 to before 12.5.2; 12.6 to before 12.6.3; 12.7 to before 12.7.2; 12.8 to before 12.8.3; 12.9 to before 12.9.1 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-3430
2026-10-03 Alias added: GHSA-hqr6-633p-3x2j
2026-10-09 EPSS moved to the 90th–95th percentile

References

Advisory 1

20200902 Cisco Jabber for Windows Protocol Handler Command Injection Vulnerability

TI-2020-03041 Cisco Jabber for Windows Message Handling Arbitrary Code Execution Vulnerability CVSS 3.1CRITICAL 9.9
TI-2020-15937 Cisco Jabber Desktop and Mobile Client Software Vulnerabilities CVSS 3.1CRITICAL 9.9
TI-2021-01198 Cisco Jabber Desktop and Mobile Client Software Vulnerabilities CVSS 3.1CRITICAL 9.9
TI-2021-01138 Cisco Jabber Desktop and Mobile Client Software Vulnerabilities CVSS 3.1CRITICAL 9.9
TI-2020-16496 Cisco Jabber Desktop and Mobile Client Software Vulnerabilities CVSS 3.1CRITICAL 9.9
TI-2020-16494 Cisco Jabber Desktop and Mobile Client Software Vulnerabilities CVSS 3.1CRITICAL 9.9

See all 33 →

Sources

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