Security readout for executives and security teams
Plain-English summary
CVE-2021-45056 is a high-severity Adobe InCopy flaw. If a user opens a malicious file, the bug could let an attacker run code with that user’s permissions. Business risk is highest where InCopy users handle files from clients, vendors, or other external sources.
Executive priority
Treat as a targeted workstation risk, not a broad internet-exposed server emergency. Patch or mitigate promptly where InCopy is used with external files, because successful exploitation could compromise the user’s workstation.
Technical view
Adobe InCopy 16.4 and earlier have an out-of-bounds write vulnerability in JPEG file parsing. The CVSS 3.0 score is 7.8, with local attack vector, low complexity, no privileges required, and required user interaction. Successful exploitation could provide high confidentiality, integrity, and availability impact in the current user context.
Likely exposure
Exposure is limited to systems running Adobe InCopy 16.4 or earlier. Risk is greater on workstations used by editorial, publishing, marketing, or design staff who open externally supplied files.
Exploitation context
The sources do not show CISA KEV listing or active exploitation. Exploitation requires user interaction: a victim must open a malicious file. No source in the bundle provides public exploit details.
Researcher notes
Evidence is clear on vulnerability class, affected product, user interaction, and impact. The bundle does not include a named fixed version, indicators, exploit availability, or active exploitation evidence. Validation should focus on software inventory and vendor advisory status.
Mitigation direction
- Inventory Adobe InCopy installations and identify versions 16.4 or earlier.
- Check Adobe APSB22-04 for the vendor-specified update or mitigation.
- Prioritize remediation for users who open external publishing or design files.
- Limit opening untrusted files until affected systems are remediated.
- Use endpoint controls to reduce impact from user-context code execution.
Validation and detection
- Confirm whether Adobe InCopy is installed on managed endpoints.
- Verify installed InCopy versions against the affected 16.4-and-earlier range.
- Confirm remediation status using Adobe APSB22-04 guidance.
- Review file-handling workflows for users receiving external content.
- Check security telemetry for unusual InCopy crashes or executions.
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-787: 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-2021-45056 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/incopy/apsb22-04.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.