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JabberApplication · Cisco

CVE-2021-1411

CRITICAL · 9.9 CVSS v3.1 Developing Published 2021-03-24
Fix available
A fix is available. Upgrade to 12.1.5 / 12.5.4 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable Zero-click

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 · unedited
Multiple vulnerabilities in Cisco Jabber for Windows, Cisco Jabber for MacOS, and Cisco Jabber for mobile platforms could allow an attacker to execute arbitrary programs on the underlying operating system with elevated privileges, access sensitive information, intercept protected network traffic, or cause a denial of service (DoS) condition. 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 · low confidence
Developing — this CVE was published recently and its authoritative NVD entry is still being established, so we're holding a technical summary until the source data settles rather than publish something unreliable. Re-checking after 2026-08-02.

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
Affected:< 12.1.5>= 12.5.0, < 12.5.4>= 12.6.0, < 12.6.5>= 12.7.0, < 12.7.4>= 12.8.0, < 12.8.5>= 12.9.0, < 12.9.5

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

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.

dbcve · scoped
Upgrade available Upgrade to 12.1.5 / 12.5.4 / 12.6.5 or later
Fixed in 12.1.512.5.412.6.5
Recommended fix High confidence

Minimum fixed version: 12.7.4 (or latest 12.x release)

  1. 1. Identify the current installed version of Cisco Jabber by opening the application and navigating to Help > About Cisco Jabber
  2. 2. Based on the current version, determine the appropriate upgrade path to the fixed release
  3. 3. Download the appropriate Cisco Jabber update from the Cisco Software Download page (software.cisco.com) or your organization's software distribution point
  4. 4. Close all instances of Cisco Jabber before installing the update
  5. 5. Run the installer with appropriate administrator privileges
  6. 6. Verify the installation completed successfully by checking the version in Help > About Cisco Jabber matches the target fixed version
Caveat Standard Jabber update; ensure compatibility with your Jabber infrastructure (IM&P, Expressway, or UCM) before upgrading production clients

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $2,300. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-1411 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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