CVE-2020-27127 | Cisco Jabber Desktop and Mobile Client Software Vulnerabilities

Multiple vulnerabilities in Cisco Jabber for Windows, Jabber for MacOS, and Jabber for mobile platforms could allow an attacker to execute arbitrary programs on the underlying operating system (OS) with elevated privileges or gain access to sensitive information. For more information about these vulnerabilities, see the Details section of this advisory.

Published: 2020-12-11 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-27127 is rated Moderate Risk (64.1/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.33%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-27127

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.44% 1.33% +0.89%
2 2026-03-18 0.34% 0.44% +0.10%
3 2025-11-21 — 0.34% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-27127

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.9 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.1 6.0 [email protected]
9.9 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.1 6.0 [email protected]
9.0 2.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2020-27127

Affected software / configurations for CVE-2020-27127

Vendor Product Version Raw CPE
cisco jabber 12.9\(0\) cpe:2.3:a:cisco:jabber:12.9\(0\):*:*:*:*:macos:*:*
cisco jabber 12.9\(0\) cpe:2.3:a:cisco:jabber:12.9\(0\):*:*:*:*:windows:*:*
cisco jabber 12.9\(1\) cpe:2.3:a:cisco:jabber:12.9\(1\):*:*:*:*:macos:*:*
cisco jabber 12.9\(1\) cpe:2.3:a:cisco:jabber:12.9\(1\):*:*:*:*:windows:*:*
cisco jabber 12.9\(2\) cpe:2.3:a:cisco:jabber:12.9\(2\):*:*:*:*:macos:*:*
cisco jabber 12.9\(2\) cpe:2.3:a:cisco:jabber:12.9\(2\):*:*:*:*:windows:*:*
cisco jabber 12.9\(3\) cpe:2.3:a:cisco:jabber:12.9\(3\):*:*:*:*:macos:*:*
cisco jabber 12.9\(3\) cpe:2.3:a:cisco:jabber:12.9\(3\):*:*:*:*:windows:*:*
cisco jabber_for_mobile_platforms 12.9\(0\) cpe:2.3:a:cisco:jabber_for_mobile_platforms:12.9\(0\):*:*:*:*:*:*:*
cisco jabber_for_mobile_platforms 12.9\(1\) cpe:2.3:a:cisco:jabber_for_mobile_platforms:12.9\(1\):*:*:*:*:*:*:*
cisco jabber_for_mobile_platforms 12.9\(2\) cpe:2.3:a:cisco:jabber_for_mobile_platforms:12.9\(2\):*:*:*:*:*:*:*
cisco jabber_for_mobile_platforms 12.9\(3\) cpe:2.3:a:cisco:jabber_for_mobile_platforms:12.9\(3\):*:*:*:*:*:*:*

References for CVE-2020-27127

cvelogic Threat Intelligence