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CVE-2020-3430

Cisco Jabber for Windows Protocol Handler Command Injection Vulnerability

HIGH
8.8
CVSS Score
Published: September 4, 2020 at 02:26 AM UTC
Updated: June 17, 2026 at 03:18 AM UTC
1 product affected across 1 vendorJabber

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Severity
HIGH8.8
Exploit prediction
EPSS 4%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Jabber· Cisco
95%
12.1 ≤ v < 12.1.312.5 ≤ v < 12.5.212.6 ≤ v < 12.6.312.7 ≤ v < 12.7.212.8 ≤ v < 12.8.312.9 ≤ v < 12.9.1
Affected range stops below 12.1.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.5.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.6.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.7.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.8.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.9.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-jabber-vY8M4KGB

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-78

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