Security readout for executives and security teams
Plain-English summary
CVE-2021-42721 is a high-severity Adobe Bridge flaw that can let a malicious file run code as the user who opens it. The business risk is mainly endpoint compromise through social engineering, not remote server takeover.
Executive priority
Treat as a prompt endpoint patching issue for creative and marketing workstations. It is not documented as actively exploited here, but successful exploitation could compromise user data and workstation integrity.
Technical view
Adobe Bridge 11.1.1 and earlier are affected by a CWE-416 use-after-free in processing Format event actions. CVSS 3.1 is 7.8, with local attack vector, low complexity, no privileges, and required user interaction.
Likely exposure
Exposure is limited to systems running Adobe Bridge 11.1.1 or earlier. Risk is higher for users who handle externally supplied creative, media, or document files.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires a victim to open a malicious file, so phishing or file-sharing lures are the likely path.
Researcher notes
Do not assume server-side exposure. The useful validation path is asset inventory, version confirmation, and endpoint telemetry review. The source bundle does not provide exploit details or fixed build numbers beyond Adobe advisory linkage.
Mitigation direction
- Identify all endpoints with Adobe Bridge installed.
- Update Adobe Bridge according to Adobe APSB21-94 guidance.
- Prioritize users who receive external media or design files.
- Restrict opening untrusted files in vulnerable Bridge versions.
- Check Adobe guidance if a direct update path is unavailable.
Validation and detection
- Confirm installed Adobe Bridge versions across managed endpoints.
- Flag Bridge 11.1.1 and earlier as vulnerable.
- Verify updated systems no longer report vulnerable versions.
- Review endpoint telemetry for suspicious Bridge child processes.
- Confirm file-handling guidance reached exposed user groups.
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-416: 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-2021-42721 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/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:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/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/apsb21-94.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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.