Security readout for executives and security teams
Plain-English summary
Adobe Bridge can be compromised if a user opens a malicious M4A file. Successful exploitation could run code with the user’s privileges, putting files, credentials, and workstation integrity at risk. The issue affects Adobe Bridge 11.1.1 and earlier, and the provided sources do not show known active exploitation.
Executive priority
Treat as a high-priority workstation patching issue, especially for teams that handle external media. The attack requires user action, which lowers urgency versus network-wormable flaws, but successful exploitation could fully compromise the current user context.
Technical view
CVE-2021-42725 is a CWE-788 memory corruption flaw in Adobe Bridge caused by insecure handling of malicious M4A files. CVSS 3.1 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 workstations where Adobe Bridge 11.1.1 or earlier is installed and users process media files from email, downloads, shared drives, or external sources.
Exploitation context
The source bundle says exploitation requires user interaction with a malicious M4A file. It is not listed as CISA KEV, and the provided sources do not substantiate active exploitation or public weaponization.
Researcher notes
Evidence is strongest for affected product, attack vector, CVSS, and required user interaction. The provided bundle does not include detailed patch version data, exploit telemetry, or environmental indicators, so validation should focus on installed Bridge versions and vendor advisory confirmation.
Mitigation direction
- Check Adobe APSB21-94 for vendor update guidance and apply the recommended Bridge update.
- Limit use of Adobe Bridge 11.1.1 or earlier until remediation is complete.
- Warn users not to open unexpected M4A files in Adobe Bridge.
- Use endpoint controls to reduce exposure to untrusted media attachments.
Validation and detection
- Inventory endpoints for Adobe Bridge installations and versions.
- Flag Bridge versions 11.1.1 and earlier as potentially affected.
- Confirm remediation status against Adobe APSB21-94 guidance.
- Review endpoint alerts involving Adobe Bridge processing unfamiliar media 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
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CWE-788: 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-2021-42725 mapping review
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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.
Access of Memory Location After End of Buffer
Access of Memory Location After End of Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.