Security readout for executives and security teams
Plain-English summary
Adobe Illustrator 25.1 and earlier can be compromised if a user opens a malicious Illustrator-related file. Successful exploitation could run attacker-controlled code as that user, putting files, credentials, and workstation access at risk.
Executive priority
Treat as a high-priority workstation patching issue for teams using Illustrator. Business urgency is higher where users exchange design files with clients, vendors, or public submissions.
Technical view
CVE-2021-21053 is a CWE-787 out-of-bounds write in Adobe Illustrator file parsing. CVSS 3.0 is 7.8 with local attack vector and required user interaction. Impact is high confidentiality, integrity, and availability compromise in the current user's context.
Likely exposure
Exposure is mainly endpoint-based: systems with Adobe Illustrator 25.1 or earlier, especially creative, marketing, design, and partner-facing teams handling external files.
Exploitation context
The provided sources do not show KEV listing or active exploitation. Exploitation requires user interaction: a victim must open a crafted malicious file. It is not described as remotely exploitable without file-opening behavior.
Researcher notes
The bundle identifies affected Illustrator 25.1 and earlier but does not include detailed fixed-version data. Analysis should stay tied to Adobe APSB21-12 and CVE metadata until vendor advisory details are reviewed directly.
Mitigation direction
- Inventory Adobe Illustrator installations and flag version 25.1 or earlier.
- Review Adobe APSB21-12 and apply the vendor-recommended update path.
- Restrict opening Illustrator files from untrusted or unexpected sources.
- Use least-privilege user accounts for design workstations where practical.
- Keep endpoint protection and attachment scanning enabled for creative file workflows.
Validation and detection
- Confirm installed Illustrator versions through endpoint inventory or software management tooling.
- Check patch-management records against Adobe APSB21-12 guidance.
- Identify users or teams regularly receiving Illustrator files from external parties.
- Review security telemetry for suspicious activity following unexpected creative-file opens.
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-2021-21053 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 (3.0)
- 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/illustrator/apsb21-12.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.