Security readout for executives and security teams
Plain-English summary
Adobe Bridge 11.0 and earlier can be compromised when a user opens a malicious TrueType font file. Successful exploitation could run code with the current user's privileges. This is a user-interaction desktop application risk, not a remotely reachable server flaw based on the supplied sources.
Executive priority
Treat as a high-priority workstation patching issue for teams that process third-party creative files. Business urgency is highest where Adobe Bridge is broadly deployed or font files arrive from external parties.
Technical view
CVE-2021-21066 is a CWE-787 out-of-bounds write in Adobe Bridge font parsing for TTF files. CVSS 3.0 is 7.8 with AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The vulnerability can affect confidentiality, integrity, and availability if triggered by a crafted file.
Likely exposure
Exposure is most likely on workstations using Adobe Bridge 11.0 or earlier, especially creative, marketing, or publishing teams that handle externally supplied fonts or design assets.
Exploitation context
The supplied sources require user interaction: a victim must open a malicious TTF file. The bundle does not cite CISA KEV listing or other evidence of active exploitation.
Researcher notes
Evidence supports local file-based code execution through TTF parsing in Adobe Bridge. The supplied data does not provide exploit details, active exploitation evidence, or exact fixed build numbers, so validation should rely on Adobe advisory guidance and local inventory.
Mitigation direction
- Apply the Adobe Bridge security update referenced by APSB21-07.
- Inventory endpoints for Adobe Bridge 11.0 or earlier.
- Warn users not to open unexpected TTF files or design bundles.
- Use endpoint controls to limit untrusted file execution paths.
- Check Adobe guidance for exact fixed versions and deployment instructions.
Validation and detection
- Confirm installed Adobe Bridge versions across managed endpoints.
- Verify APSB21-07 remediation is deployed where Bridge is present.
- Review asset intake workflows for externally supplied font files.
- Check endpoint detections for suspicious activity around font files.
- Document exceptions and compensating controls for unmanaged systems.
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
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-2021-21066 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/bridge/apsb21-07.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.