Security readout for executives and security teams
Plain-English summary
This is a critical server-side flaw in Adobe Connect. An unauthenticated network attacker could abuse unsafe deserialization of AMF messages to execute code on an affected Connect server, potentially taking over the service and its data.
Executive priority
Treat as urgent for any organization running Adobe Connect. A vulnerable internet-facing server could become a full compromise point, affecting confidentiality, integrity, and availability without requiring credentials or user interaction.
Technical view
CVE-2021-40719 is CWE-502 in Adobe Connect 11.2.3 and earlier. Deserialization of untrusted AMF data can lead to arbitrary method invocation and remote code execution. CVSS 3.0 is 9.8, with network access, low complexity, no privileges, and no user interaction required.
Likely exposure
Exposure is most relevant where Adobe Connect 11.2.3 or earlier is deployed, especially if reachable from the internet or untrusted networks. The bundle does not list CPEs, deployment defaults, or exact fixed versions.
Exploitation context
The source bundle does not show CISA KEV listing or other cited evidence of active exploitation. Risk remains high because the issue is unauthenticated, network-reachable, low-complexity remote code execution on a server product.
Researcher notes
Evidence is limited to the CVE record and Adobe advisory reference. Do not assume exploit availability, affected CPEs, or a specific fixed version from this bundle alone. Focus validation on version discovery, network exposure, and vendor advisory alignment.
Mitigation direction
- Review Adobe APSB21-91 for the vendor-approved security update or remediation path.
- Identify and upgrade any Adobe Connect 11.2.3 or earlier deployments.
- Restrict Adobe Connect access to trusted networks until remediation is complete.
- Prioritize externally reachable servers ahead of internal-only systems.
- Monitor Adobe Connect servers for unexpected process, account, or configuration changes.
Validation and detection
- Inventory Adobe Connect servers and record exact product versions.
- Confirm whether any deployment is version 11.2.3 or earlier.
- Check whether Connect endpoints are reachable from the internet or partner networks.
- Verify remediation status against Adobe APSB21-91, not inferred package names.
- Review server logs for suspicious AMF or application errors around Connect services.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-40719 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/connect/apsb21-91.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.