Security readout for executives and security teams
Plain-English summary
CVE-2017-8906 is a denial-of-service flaw in x265 through version 2.4. When affected encoding code processes a very small picture, an integer underflow can crash or disrupt the encoding process. Business impact is mainly availability for services that accept untrusted media for encoding.
Executive priority
Treat this as a targeted availability risk. Prioritize internet-facing or customer-upload media services first. It is less urgent than a confirmed remote code execution issue, but outages in encoding pipelines can still affect revenue and customer trust.
Technical view
The issue is an integer underflow in pixel-a.asm, the x86 assembly implementation of planeClipAndMax() in MulticoreWare x265 through 2.4. The vulnerable code is used by x265_encoder_encode and may be present in dependent products such as libbpg. The CVE describes denial of service during encoding, not code execution.
Likely exposure
Exposure is most likely in media-processing services, upload pipelines, or applications embedding x265 through 2.4, including products using x265_encoder_encode through libbpg. The source bundle does not provide complete affected CPEs or downstream product lists.
Exploitation context
The public CVE description says a small picture can trigger the underflow and cause denial of service during encoding. The source bundle does not cite active exploitation, and CISA KEV status is false.
Researcher notes
Evidence is limited to the CVE record and the referenced x265 issue. No CVSS, CWE, CPE list, fixed version, or active exploitation evidence is provided in the bundle. Avoid assuming downstream exposure without confirming bundled x265 versions.
Mitigation direction
- Inventory direct and bundled x265 usage, especially versions through 2.4.
- Check MulticoreWare x265 guidance for fixed versions or recommended patches.
- Review dependent products such as libbpg for bundled x265 exposure.
- Limit untrusted media encoding where operationally feasible.
- Add input-size validation around media encoding workflows where supported.
Validation and detection
- Confirm deployed x265 library versions and build provenance.
- Identify applications calling x265_encoder_encode or bundling libbpg.
- Review crash logs for failures during small-picture encoding.
- Run non-production regression testing for undersized media inputs.
- Verify vendor advisories before declaring remediation complete.
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-2017-8906 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://bitbucket.org/multicoreware/x265/issues/345/integer-underflow-in-x265-source-commonCVE 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.