Security readout for executives and security teams
Plain-English summary
This CVE is a denial-of-service flaw in Bento4 through v1.6.0-636. A malformed media file could trigger a NULL pointer dereference and crash software using the affected Bento4 code. The main business risk is service interruption in systems that process untrusted audio/video files.
Executive priority
Treat this as a moderate availability risk. Prioritize review if Bento4 handles customer-uploaded or internet-sourced media, especially in revenue, support, or security-sensitive processing pipelines.
Technical view
The issue is a NULL pointer dereference in AP4_StszAtom::WriteFields in Ap4StszAtom.cpp. The source bundle identifies Bento4 through v1.6.0-636 and describes attacker-triggered denial of service. No CVSS score, CWE, fixed version, or vendor mitigation is provided in the supplied sources.
Likely exposure
Exposure is most likely where Bento4 is embedded in media ingestion, transcoding, validation, preview, or file-processing workflows that accept external MP4-like content.
Exploitation context
The supplied sources do not show CISA KEV listing or active exploitation. A public GitHub issue is referenced, but the bundle only supports denial-of-service impact, not remote code execution or confirmed real-world attacks.
Researcher notes
Evidence is limited to the CVE description and referenced GitHub issue. The affected range is stated in prose, while structured affected-product data is not populated. No patch, CVSS vector, CWE mapping, or exploitation confirmation is provided.
Mitigation direction
- Inventory Bento4 usage, including embedded or statically linked copies.
- Check Bento4 upstream issue and release notes for fixed versions or maintainer guidance.
- Restrict untrusted media processing where Bento4 exposure is confirmed.
- Add isolation, restart, and resource controls around media parsing workers.
- Prioritize systems processing unauthenticated or customer-supplied files.
Validation and detection
- Confirm whether deployed Bento4 versions are v1.6.0-636 or earlier.
- Identify services that pass untrusted media files into Bento4 parsing paths.
- Review crash logs for AP4_StszAtom::WriteFields or Ap4StszAtom.cpp references.
- Check dependency manifests and container images for bundled Bento4 copies.
- Validate remediation against vendor guidance when a fixed release is identified.
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-2021-35306 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://github.com/axiomatic-systems/Bento4/issues/615CVE 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.