Security readout for executives and security teams
Plain-English summary
CVE-2021-38093 is an integer overflow in FFmpeg 4.2.1 that may let an attacker crash a media-processing workflow or cause other unspecified impact. Business risk depends on whether FFmpeg processes untrusted media files in exposed services.
Executive priority
Prioritize if FFmpeg handles customer or internet-sourced media. For internal-only media workflows, handle through normal patch management unless instability is observed.
Technical view
The reported flaw is in FFmpeg's libavfilter/vf_convolution.c, specifically the filter_robert function. The source bundle identifies denial of service and unspecified impact, with a related FFmpeg ticket and commit, but no CVSS, CWE, detailed affected matrix, or exploit evidence.
Likely exposure
Most exposure is likely in applications, pipelines, or SaaS features that use FFmpeg 4.2.1 to process user-supplied media. Embedded FFmpeg copies may be missed by package-only scans.
Exploitation context
The bundle does not cite active exploitation, and CISA KEV status is false. Treat exploitation as unconfirmed. The practical concern is attacker-controlled media reaching vulnerable FFmpeg processing paths.
Researcher notes
Evidence is sparse: the CVE description names FFmpeg 4.2.1 and the vulnerable function, but the bundle lacks CVSS, CWE, exploit details, and fixed release mapping. Validate against the upstream ticket and commit.
Mitigation direction
- Inventory systems and applications using FFmpeg 4.2.1.
- Review the FFmpeg ticket and referenced commit for vendor fix context.
- Upgrade to a supported vendor build that includes the fix.
- Limit untrusted media processing until affected deployments are updated.
- Monitor FFmpeg package advisories from operating system vendors.
Validation and detection
- Check deployed FFmpeg versions and embedded library copies.
- Identify services that process user-uploaded or third-party media.
- Confirm whether builds include commit 99f8d32129dd233d4eb2efa44678a0bc44869f23.
- Review crash telemetry for FFmpeg media-processing failures.
- Ensure dependency scanning covers vendored FFmpeg binaries.
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-2021-38093 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.