Security readout for executives and security teams
Plain-English summary
This is a low-severity Adobe FrameMaker issue triggered when a user opens a malicious TIF file. Successful exploitation could disclose sensitive memory and help bypass protections such as ASLR, but it requires local file interaction and does not provide code execution in the provided sources.
Executive priority
Treat this as a targeted workstation hygiene issue, not an emergency. Prioritize teams using FrameMaker with external files, apply Adobe guidance, and reduce risky file-opening workflows. Business urgency is low unless FrameMaker is widely used in sensitive document production.
Technical view
CVE-2021-39833 is a CWE-125 out-of-bounds read in Adobe FrameMaker TIF parsing. Affected versions are FrameMaker 2019 Update 8 and earlier, and 2020 Release Update 2 and earlier. CVSS is 3.3: local attack vector, low complexity, no privileges, user interaction required, confidentiality impact only.
Likely exposure
Exposure is mainly workstations where Adobe FrameMaker is installed and users handle external or untrusted TIF files. Organizations without FrameMaker, or with workflows blocking unsolicited image files, have lower practical exposure.
Exploitation context
The source bundle does not show active exploitation, and the CVE is not marked KEV. Exploitation requires a victim to open a malicious TIF file in FrameMaker. The documented outcome is sensitive memory disclosure and possible mitigation bypass support, not direct system compromise.
Researcher notes
The provided evidence supports an out-of-bounds read information disclosure flaw in TIF parsing. No exploit code, active exploitation, or detailed patch state is included in the bundle. Avoid assuming broader Adobe product impact or direct code execution without additional vendor evidence.
Mitigation direction
- Inventory Adobe FrameMaker installations and versions across managed endpoints.
- Review Adobe APSB21-74 for vendor-directed update or mitigation guidance.
- Prioritize systems using FrameMaker with external customer, vendor, or publishing files.
- Restrict opening unsolicited TIF files in FrameMaker where operationally feasible.
- Use endpoint controls to quarantine suspicious attachments and downloaded TIF files.
Validation and detection
- Confirm whether FrameMaker 2019 Update 8 or earlier is installed.
- Confirm whether FrameMaker 2020 Release Update 2 or earlier is installed.
- Check software inventory for unmanaged FrameMaker installations.
- Review security telemetry for suspicious TIF files delivered to FrameMaker users.
- Document whether Adobe vendor guidance has been applied.
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-125: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-39833 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
- Low
- CVSS
- 3.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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:L/I:N/A:N1.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
3.3LowVector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/framemaker/apsb21-74.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 Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.