CVE-2020-3430

highpriority · track · 36EPSS 0.039 · 90 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

3.90% (90th) EPSS

CVSS 9.3 · high

Is it mine?

14 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Jabbercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

9.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.09.3highAV:N/AC:M/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 8.6 · impact 10

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.18.8highAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · psirt@cisco.com USexploitability 2.8 · impact 5.9

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-78USprimaryCWE-78US

affected products (14)

Products and version ranges known to be affected.

Cisco Cisco Jabberall versionscisco_csafUS
Cisco Cisco Jabber≤ n/aenisa_euvdEU
Cisco Systems Inc. Jabber for Windows12.1 → 12.1.3fstec_bduRU
Cisco Systems Inc. Jabber for Windows12.5 → 12.5.2fstec_bduRU
Cisco Systems Inc. Jabber for Windows12.6 → 12.6.3fstec_bduRU
Cisco Systems Inc. Jabber for Windows12.7 → 12.7.2fstec_bduRU
Cisco Systems Inc. Jabber for Windows12.8 → 12.8.3fstec_bduRU
Cisco Systems Inc. Jabber for Windows12.9 → 12.9.1fstec_bduRU
cisco jabber12.1 → 12.1.3nvdUScpe:2.3:a:cisco:jabber:*:*:*:*:*:*:*:*
cisco jabber12.5 → 12.5.2nvdUScpe:2.3:a:cisco:jabber:*:*:*:*:*:*:*:*
cisco jabber12.6 → 12.6.3nvdUScpe:2.3:a:cisco:jabber:*:*:*:*:*:*:*:*
cisco jabber12.7 → 12.7.2nvdUScpe:2.3:a:cisco:jabber:*:*:*:*:*:*:*:*
cisco jabber12.8 → 12.8.3nvdUScpe:2.3:a:cisco:jabber:*:*:*:*:*:*:*:*
cisco jabber12.9 → 12.9.1nvdUScpe:2.3:a:cisco:jabber:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-jabber-vY8M4KGBCisco Jabber for Windows Protocol Handler Command Injection Vulnerability2020-09-02csaf · cisco_csafUS
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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2020-09-04modified 2026-06-17

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references (7)

External citations — patches, advisories, analysis.

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