Security readout for executives and security teams
Plain-English summary
An attacker can get code running on a user's machine if they convince an Adobe After Effects user to open a malicious file. It is not a network worm: the victim must interact with the file. Compromise inherits the user's privileges, which can still expose projects, credentials, and workstation data.
Executive priority
Treat this as a high-priority workstation patching issue for creative teams. It needs user interaction, but a successful attack can run code as the user and affect sensitive projects or credentials. Address exposed After Effects installations promptly, especially where staff receive outside files.
Technical view
CVE-2021-35993 is a CWE-787 out-of-bounds write in Adobe After Effects file parsing. The CVSS 3.1 score is 7.8 with local attack vector, no privileges required, and user interaction required. Successful exploitation may allow arbitrary code execution in the current user's context.
Likely exposure
Exposure is limited to systems running Adobe After Effects 18.2.1 or earlier, based on the supplied CVE description. Creative workstations that open externally supplied files are the most relevant population. The bundle does not identify server-side exposure or other affected Adobe products.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires convincing a victim to open a malicious file, so phishing, file sharing, and supplier-delivered assets are the practical risk paths. No exploit maturity details are provided.
Researcher notes
The available data supports code execution via an out-of-bounds write during specially crafted file parsing. The bundle does not include patch version details, proof-of-concept status, or telemetry showing exploitation. Avoid expanding scope beyond Adobe After Effects 18.2.1 and earlier without additional vendor evidence.
Mitigation direction
- Review Adobe APSB21-54 and apply the listed After Effects security update.
- Prioritize users who handle external creative files or supplier-provided assets.
- Restrict opening untrusted files on systems with outdated After Effects.
- Use endpoint detection controls for suspicious child processes from After Effects.
Validation and detection
- Inventory installed Adobe After Effects versions across workstations.
- Confirm whether any installation is version 18.2.1 or earlier.
- Verify affected systems received the Adobe APSB21-54 update guidance.
- Check endpoint logs for unusual After Effects process activity.
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-787: 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-2021-35993 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
- 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/after_effects/apsb21-54.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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.