JabberApplication · Cisco
CVE-2020-27134
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedMultiple 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceMultiple vulnerabilities in Cisco Jabber for Windows, macOS, and mobile platforms allow an attacker to execute arbitrary programs on the underlying OS with elevated privileges or gain access to sensitive information. The specific vulnerability types and technical details are not provided in this description.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
JabberApplication
= 12.9\(0\)= 12.9\(1\)= 12.9\(2\)= 12.9\(3\)
Jabber For Mobile PlatformsApplication
= 12.9\(0\)= 12.9\(1\)= 12.9\(2\)= 12.9\(3\)CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Cisco Jabber installation on WindowsOpen Control Panel > Programs and Features, or run 'Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion' in PowerShell to list installed programs and their versionsAffected if Cisco Jabber appears with version 12.9, 12.9.1, 12.9.2, or 12.9.3
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Identify Cisco Jabber installation on macOSOpen Finder > Applications, right-click Cisco Jabber.app > Get Info to view the version number, or run 'defaults read /Applications/Cisco\ Jabber.app/Contents/Info CFBundleShortVersionString' in TerminalAffected if Cisco Jabber is installed with version 12.9, 12.9.1, 12.9.2, or 12.9.3
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Identify Cisco Jabber for Mobile installation on iOSOpen Settings > General > iPhone Storage (or Storage), find Cisco Jabber in the app list and view the version number beneath the app iconAffected if Cisco Jabber for iOS shows version 12.9, 12.9.1, 12.9.2, or 12.9.3
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Identify Cisco Jabber for Mobile installation on AndroidOpen Google Play Store > My Apps & Games, locate Cisco Jabber, or open device Settings > Apps > Cisco Jabber to view the version under App InfoAffected if Cisco Jabber for Android shows version 12.9, 12.9.1, 12.9.2, or 12.9.3
A user is affected if Cisco Jabber (Windows, macOS, iOS, or Android) is installed and the detected version matches exactly 12.9, 12.9.1, 12.9.2, or 12.9.3.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the vendor patches provided by Cisco for affected versions of Jabber across all platforms (Windows, macOS, mobile). Prioritize patching given the critical (9.9) severity rating.
Fix this in Jabber
Scoped from the published advisory
- Consultation4.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-27134 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-27134 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data