Security readout for executives and security teams
Plain-English summary
CVE-2021-38091 is an FFmpeg 4.2.1 integer overflow in the convolution video filter code. The public record says attackers can cause denial of service or other unspecified impacts. Business urgency depends on whether systems process untrusted media through FFmpeg filtering paths.
Executive priority
Treat as conditional priority. Escalate for internet-facing or customer-upload media services using FFmpeg 4.2.1; otherwise handle through normal patch and dependency hygiene.
Technical view
The issue is in filter16_sobel in libavfilter/vf_convolution.c. The cited FFmpeg ticket and commit are the only remediation context provided. No CVSS score, CWE, detailed affected matrix, or exploit evidence is included in the bundle.
Likely exposure
Exposure is most likely in applications, services, pipelines, or appliances embedding FFmpeg 4.2.1 and processing untrusted video with convolution/Sobel filtering enabled or reachable.
Exploitation context
The bundle does not show active exploitation, and the CVE is not listed as KEV. Public impact wording is limited to denial of service or unspecified impacts, so exploitation conditions and reliability are unclear.
Researcher notes
Evidence is sparse: the CVE names one function and version, with a linked ticket and commit. Avoid broad product claims unless local dependency analysis confirms embedded FFmpeg exposure.
Mitigation direction
- Identify FFmpeg 4.2.1 deployments and bundled copies.
- Review the referenced FFmpeg commit and vendor guidance for upgrade direction.
- Prioritize systems processing untrusted or user-supplied media.
- Reduce exposure of media-processing paths until patched, where operationally feasible.
- Monitor FFmpeg and downstream vendor advisories for affected-version clarification.
Validation and detection
- Inventory product and container images for FFmpeg 4.2.1.
- Confirm whether libavfilter convolution or Sobel filtering is used.
- Check crash, worker restart, and media-processing failure logs.
- Verify downstream packages include the referenced FFmpeg fix.
- Track compensating controls for systems processing external media.
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.
CVE-2021-38091 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://trac.ffmpeg.org/ticket/8263CVE reference · x_refsource_MISC
- https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/99f8d32129dd233d4eb2efa44678a0bc44869f23CVE 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.