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ConnectApplication · Adobe

CVE-2021-40719

CRITICAL · 9.8 CVSS v3.0 Published 2021-10-21
Fix available
A fix is available. Upgrade to after 11.2.3 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges 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
Adobe Connect version 11.2.3 (and earlier) is affected by a Deserialization of Untrusted Data vulnerability to achieve arbitrary method invocation when AMF messages are deserialized on an Adobe Connect server. An attacker can leverage this to execute remote code execution on the server.

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 · high confidence

Adobe Connect versions 11.2.3 and earlier contain a deserialization vulnerability in AMF (Action Message Format) message processing. Attackers can send specially crafted AMF messages to achieve arbitrary method invocation on the server, leading to remote code execution.

MitigationUpgrade Adobe Connect to version 11.2.4 or later. If immediate patching is not possible, consider restricting access to AMF endpoints via network controls or WAF rules targeting AMF traffic.

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
ConnectApplication
Affected:<= 11.2.3

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
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify Adobe Connect installation version
    Locate the Adobe Connect installation directory and check the version information, typically found in the installer file name, a version.txt file, or the application's about/properties window
    Affected if The installed version is 11.2.3 or earlier (any version up to and including 11.2.3)
  2. Verify AMF endpoint accessibility
    Identify whether the /api endpoint (or similar AMF service endpoints) is accessible from the network. Check web server configuration files or use a web request tool to probe for AMF-related paths
    Affected if AMF endpoints are exposed and reachable from untrusted networks
  3. Confirm application is running and exposed
    Determine if the Adobe Connect web application is actively running and accessible over HTTP/HTTPS. Check service status and listener ports
    Affected if Adobe Connect is running and accessible externally without network restrictions
  4. Review deserialization configuration
    Examine the application's configuration files for custom AMF deserialization settings or third-party modules that handle AMF message processing
    Affected if Custom or non-default AMF deserialization handlers are configured

You are affected if Adobe Connect version 11.2.3 or earlier is installed and the AMF message processing endpoint is network-accessible, since the deserialization vulnerability can be exploited remotely.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 a release after 11.2.3
Interim mitigation

Upgrade Adobe Connect to version 11.2.4 or later. If immediate patching is not possible, consider restricting access to AMF endpoints via network controls or WAF rules targeting AMF traffic.

Recommended fix Moderate confidence

Adobe Connect 11.2.4 or later

  1. 1. Backup the current Adobe Connect installation and database before any upgrade.
  2. 2. Download Adobe Connect version 11.2.4 or later from the official Adobe website or Adobe Admin Console.
  3. 3. Install the upgrade following Adobe's standard upgrade documentation.
  4. 4. Verify the installation by checking the Adobe Connect version in the administration dashboard.
  5. 5. Test critical functionality to ensure the upgrade did not break existing workflows.
  6. 6. Monitor Adobe's security advisories for any additional required updates.
Caveat Review Adobe Connect 11.2.4 release notes for any compatibility changes or deprecated features before upgrading

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

Fix this in Connect Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing6.0 h
  • Review / QA3.0 h
19.0 hours of engineering $3,320
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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-2021-40719 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