Security readout for executives and security teams
Plain-English summary
CVE-2021-21092 is a high-severity Adobe Bridge file-parsing flaw. If a user opens a malicious DCM file, an attacker could run code with that user’s permissions. The main business risk is compromise of workstations used in creative or media workflows, especially where files arrive from outside parties.
Executive priority
Treat as a priority endpoint remediation issue, not an internet-edge emergency. The vulnerability can lead to full user-context code execution, but it requires user interaction and the provided evidence does not establish active exploitation.
Technical view
Adobe Bridge 10.1.1 and earlier, and 11.0.1 and earlier, have a memory corruption vulnerability during specially crafted file parsing. The CVSS 3.0 score is 7.8 with local attack vector, no privileges required, and required user interaction. CWE-788 is listed, indicating access outside intended memory bounds.
Likely exposure
Exposure is likely limited to endpoints with affected Adobe Bridge versions installed. Risk is higher for teams that regularly open externally supplied image, media, or DCM-related files in Bridge.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires social engineering or another delivery path that persuades a user to open a malicious file.
Researcher notes
Focus validation on version exposure and file-handling paths. The source bundle identifies memory corruption, CWE-788, and arbitrary code execution, but does not provide exploit details or enough evidence to claim active exploitation.
Mitigation direction
- Inventory Adobe Bridge installations and versions across managed endpoints.
- Prioritize systems running Bridge 10.1.1 or earlier, or 11.0.1 or earlier.
- Apply Adobe’s guidance from APSB21-23 for fixed or supported versions.
- Limit opening untrusted DCM files until affected systems are remediated.
- Remove Adobe Bridge where it is not business-required.
Validation and detection
- Confirm endpoint software inventory includes Adobe Bridge version data.
- Check whether affected versions remain on user workstations.
- Verify remediation against Adobe APSB21-23, not just package deployment status.
- Review email, download, and file-sharing controls for suspicious DCM file delivery.
- Document any compensating controls for systems that cannot be updated promptly.
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-788: 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-2021-21092 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/apsb21-23.htmlCVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-415/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.
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.