Security readout for executives and security teams
Plain-English summary
This vulnerability affects Adobe Premiere Pro when a user opens a malicious MP4 file. It can expose sensitive memory from the application and may help bypass protections like ASLR, but it requires user interaction and is rated low severity.
Executive priority
Treat this as a low-severity workstation risk. Remediate through normal patch management, with faster action for creative teams handling untrusted media from external parties.
Technical view
CVE-2021-43751 is a CWE-125 out-of-bounds read in Adobe Premiere Pro MP4 parsing. Affected versions are Premiere Pro 22.0 and earlier, and 15.4.2 and earlier. CVSS 3.1 is 3.3 with local attack vector, required user interaction, low confidentiality impact, and no integrity or availability impact.
Likely exposure
Exposure is most relevant where affected Premiere Pro versions are installed and users can receive or open untrusted MP4 files. Systems that process media from external clients, submissions, or shared drives have higher practical exposure.
Exploitation context
The provided sources do not indicate active exploitation, and the CVE is not listed as KEV. Exploitation requires a victim to open a malicious file. The likely attacker goal is memory disclosure that could support bypassing mitigations such as ASLR.
Researcher notes
Evidence supports an out-of-bounds read in MP4 parsing with confidentiality-only impact. The source bundle does not provide fixed version details beyond the vendor advisory reference, so remediation should follow Adobe APSB21-117 rather than inferred version targets.
Mitigation direction
- Review Adobe APSB21-117 for the vendor-supported fix path.
- Update affected Premiere Pro installations according to Adobe guidance.
- Restrict opening MP4 files from untrusted or unknown sources.
- Use endpoint controls to reduce exposure to suspicious media attachments.
- Prioritize users handling external media submissions or client-provided files.
Validation and detection
- Inventory installed Adobe Premiere Pro versions across managed endpoints.
- Identify systems running version 22.0 or earlier, or 15.4.2 or earlier.
- Confirm Adobe APSB21-117 remediation status for affected installations.
- Review user workflows that involve opening externally supplied MP4 files.
- Check whether media-handling endpoints receive stronger attachment and download controls.
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-125: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-43751 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
- Low
- CVSS
- 3.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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:L/I:N/A:N1.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.3LowVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/premiere_pro/apsb21-117.htmlCVE reference · vendor-advisory
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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.