Security readout for executives and security teams
Plain-English summary
Adobe Prelude 10.1 and earlier can be compromised when a user opens a malicious MXF media file. Successful exploitation could run code with that user’s permissions, making creative workstations and media-ingest workflows the main concern. The source bundle does not show active exploitation.
Executive priority
Treat this as a targeted workstation risk, not an internet-exposed server emergency. Prioritize teams that ingest third-party media files and ensure affected Prelude installations follow Adobe guidance.
Technical view
CVE-2021-42738 is a CWE-788 memory corruption flaw in Adobe Prelude’s MXF file parsing. The CVSS 3.1 score is 7.8: local attack vector, low complexity, no privileges, user interaction required, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on endpoints running Adobe Prelude 10.1 or earlier, especially systems that open MXF files from clients, partners, archives, or shared media storage.
Exploitation context
Exploitation requires a victim to open a specially crafted MXF file. The provided KEV status is false, and no cited source in the bundle confirms exploitation in the wild.
Researcher notes
The bundle supports arbitrary code execution in the current user context through malicious MXF parsing. It does not include exploit proof, fixed-version details, or telemetry confirming active exploitation, so avoid claiming more than the CVE and Adobe advisory establish.
Mitigation direction
- Inventory Adobe Prelude installations and identify versions 10.1 or earlier.
- Check Adobe APSB21-96 for the supported fixed version or vendor-directed action.
- Restrict opening MXF files from untrusted or unexpected sources.
- Use least-privilege user accounts on media workstations.
- Prioritize controls around email, file-sharing, and media-ingest paths.
Validation and detection
- Confirm installed Adobe Prelude versions on creative and media-handling endpoints.
- Review whether users handle external MXF files in normal workflows.
- Check endpoint telemetry for suspicious Prelude crashes or child processes.
- Verify Adobe guidance has been applied where affected versions exist.
- Document any systems that cannot be updated and compensating controls used.
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
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CWE-788: Exact CWE lookup
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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-2021-42738 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/prelude/apsb21-96.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.
Access of Memory Location After End of Buffer
Access of Memory Location After End of Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.