Security readout for executives and security teams
Plain-English summary
CVE-2021-38090 is an integer overflow reported in FFmpeg 4.2.1. The public description says it may let an attacker cause denial of service or other unspecified impact. Business risk is mainly availability for services that process untrusted media, but public scoring and affected-version detail are incomplete.
Executive priority
Treat this as a targeted availability risk, not a confirmed emergency. Prioritize systems that automatically process external media, then patch through normal vendor channels once applicability is confirmed.
Technical view
The issue is in FFmpeg libavfilter/vf_convolution.c, function filter16_roberts. The source bundle names FFmpeg 4.2.1 and references an FFmpeg Trac ticket and commit. No CVSS, CWE, detailed affected CPEs, or exploit mechanics are provided in the bundle.
Likely exposure
Exposure is most plausible where FFmpeg 4.2.1 or derived builds process attacker-controlled media with affected filtering code. The bundle does not identify broader affected versions, downstream packages, or default exposure paths.
Exploitation context
The bundle does not show CISA KEV listing or cite active exploitation. Public impact is described only as denial of service or unspecified effects, so exploitation status and practical attack conditions remain unconfirmed.
Researcher notes
Evidence is sparse: the CVE text names FFmpeg 4.2.1, a specific function, and broad impact only. Absence from KEV and missing CVSS reduce certainty; verify against upstream FFmpeg and distro advisories before declaring scope.
Mitigation direction
- Inventory FFmpeg versions and downstream packages in media-processing systems.
- Check the referenced FFmpeg ticket and commit for vendor-confirmed remediation details.
- Apply vendor or distribution updates when they include the referenced fix.
- Limit processing of untrusted media on unpatched systems where operationally possible.
- Prioritize externally reachable media ingestion and automated transcoding services.
Validation and detection
- Confirm whether deployed FFmpeg builds report version 4.2.1 or related package lineage.
- Review package changelogs for commit 99f8d32129dd233d4eb2efa44678a0bc44869f23.
- Identify services that invoke FFmpeg filters on user-supplied media.
- Check incident logs for unexplained FFmpeg crashes or service restarts.
- Verify updated builds remain compatible with normal media-processing workflows.
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-2021-38090 mapping review
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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.