Security readout for executives and security teams
Plain-English summary
Adobe InCopy 16.4 and earlier can be compromised if a user opens a malicious file. Successful exploitation could run attacker-controlled code with that user’s permissions, risking data theft, workstation takeover, or lateral movement from a creative or publishing endpoint.
Executive priority
Treat as a high-priority workstation risk for creative and publishing teams. It is not wormable, but a convincing malicious file could give an attacker code execution on a user endpoint with access to business content.
Technical view
CVE-2021-45053 is a CWE-787 out-of-bounds write in Adobe InCopy JPEG2000 parsing. The CVSS 3.0 score is 7.8 with local attack vector, low complexity, no privileges required, and required user interaction. Impact is high for confidentiality, integrity, and availability.
Likely exposure
Exposure is most likely on endpoints running Adobe InCopy 16.4 or earlier, especially where users receive or open external publishing, image, or document files. The source bundle does not identify server-side exposure or other affected Adobe products.
Exploitation context
Exploitation requires user interaction: the victim must open a malicious file. The source bundle does not show CISA KEV listing or other evidence of active exploitation, so active exploitation should not be assumed.
Researcher notes
The strongest evidence is the CVE description and Adobe bulletin reference. The bundle identifies JPEG2000 parsing and out-of-bounds write but does not provide root-cause detail, proof-of-concept status, fixed build numbers, or observed exploitation.
Mitigation direction
- Inventory Adobe InCopy installations and identify any version 16.4 or earlier.
- Review Adobe APSB22-04 and apply the vendor-recommended update or mitigation.
- Restrict opening untrusted publication or image files until affected endpoints are remediated.
- Use endpoint controls to limit code execution from user-writable locations where feasible.
Validation and detection
- Confirm installed Adobe InCopy versions on managed endpoints.
- Verify remediation against Adobe APSB22-04 guidance, not just package deployment status.
- Review EDR telemetry for suspicious child processes spawned from InCopy.
- Check whether users handling external files are still on affected versions.
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-2021-45053 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/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.