Security readout for executives and security teams
Plain-English summary
This vulnerability affects Adobe Bridge desktop users. A malicious PDF or specially crafted file could make Bridge run attacker-controlled code after a user opens it. The code would run with that user’s permissions, so impact depends on workstation access and user privileges.
Executive priority
Treat this as a high-priority workstation patching issue, especially for creative teams handling external files. It is not described as remotely exploitable without user interaction, but successful exploitation could compromise the user’s workstation and data.
Technical view
CVE-2021-21094 is a CWE-787 out-of-bounds write in Adobe Bridge file parsing. Affected versions are Bridge 10.1.1 and earlier and 11.0.1 and earlier. CVSS is 7.8 high. Attack requires local user interaction and can lead to arbitrary code execution in the current user context.
Likely exposure
Exposure is mainly on workstations running Adobe Bridge 10.1.1 or earlier, or 11.0.1 or earlier. Creative, marketing, publishing, and design teams are the most likely users. Server-side exposure is not indicated by the provided sources.
Exploitation context
The sources do not show CISA KEV listing or confirmed active exploitation. Exploitation requires the victim to open a malicious file, which makes phishing, shared-file workflows, and untrusted creative assets the practical risk paths.
Researcher notes
The evidence identifies an out-of-bounds write in Adobe Bridge PDF/file parsing with arbitrary code execution potential. The source bundle does not provide exploit details, active exploitation evidence, or specific fixed versions; use Adobe APSB21-23 for definitive remediation guidance.
Mitigation direction
- Update Adobe Bridge according to Adobe APSB21-23 guidance.
- Remove affected Bridge versions where business use is not required.
- Limit opening untrusted PDFs or files in Bridge until patched.
- Prioritize remediation on systems handling external creative assets.
- Use least-privilege desktop accounts to reduce post-exploitation impact.
Validation and detection
- Inventory Adobe Bridge installations across managed endpoints.
- Flag Bridge 10.1.1 and earlier, and 11.0.1 and earlier.
- Confirm patched state against Adobe APSB21-23.
- Review endpoint controls for untrusted attachment handling.
- Check whether high-risk teams regularly process external files.
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-2021-21094 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/bridge/apsb21-23.htmlCVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-416/CVE 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.