Security readout for executives and security teams
Plain-English summary
CVE-2021-40703 is a high-severity Adobe Premiere Elements flaw where a malicious m4a file can corrupt memory and run code as the signed-in user. It requires user interaction, so risk is tied to users opening or importing untrusted media files.
Executive priority
Treat this as a workstation software risk requiring timely patch verification, especially for users who receive third-party media. It is serious but not described as remotely exploitable without user action.
Technical view
Adobe Premiere Elements 2021.2235820 and earlier are described as vulnerable to memory corruption from insecure handling of malicious m4a files. The CVSS 3.0 score is 7.8 with local attack vector, low complexity, no privileges required, user interaction required, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on workstations where Adobe Premiere Elements 2021.2235820 or earlier is installed and users handle externally supplied audio or media files.
Exploitation context
The provided sources do not indicate known active exploitation or CISA KEV listing. Exploitation requires convincing a user to open or process a malicious m4a file in the affected application.
Researcher notes
Evidence supports a malicious-file memory corruption issue mapped to CWE-788 with arbitrary code execution in current-user context. The provided bundle does not include exploit proof, active exploitation evidence, or detailed fixed-version text beyond the Adobe advisory reference.
Mitigation direction
- Check Adobe APSB21-78 for the authoritative update or remediation guidance.
- Update affected Adobe Premiere Elements installations according to Adobe guidance.
- Warn users not to open unsolicited or untrusted m4a/media files.
- Limit local user privileges where affected software remains installed.
- Monitor vendor advisories if exact local patch status is unclear.
Validation and detection
- Inventory endpoints for Adobe Premiere Elements installations and versions.
- Flag installations at version 2021.2235820 or earlier for remediation review.
- Confirm applied updates against Adobe APSB21-78 guidance.
- Review security telemetry for unusual Premiere Elements crashes or child processes.
- Verify users handling external media have updated software.
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-788: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2021-40703 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/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:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.8HighVector: CVSS:3.0/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/premiere_elements/apsb21-78.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.