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PatchSiren cyber security CVE debrief

CVE-2016-20099 l-smash CVE debrief

CVE-2016-20099 is a vulnerability in L-SMASH through version 2.14.5, which contains an infinite loop in the VC-1 importer probe. This allows attackers to cause a denial of service by supplying a crafted input file, specifically a file consisting only of zero bytes, leading to indefinite CPU consumption. The vulnerability can cause denial of service through CPU consumption and potential system hang or crash. Defenders should prioritize verifying versions and assessing exposure. The CVE record and source item provide details about the vulnerability, including its description and potential impact.

Vendor
l-smash
Product
Unknown
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Defenders responsible for systems using L-SMASH through version 2.14.5 should assess exposure and prioritize verification of versions in use. Defenders should verify L-SMASH versions in use and assess exposure. The vulnerability can cause denial of service through CPU consumption and potential system hang or crash.

Why it matters

CVE-2016-20099 is a vulnerability in L-SMASH that can cause denial of service through an infinite loop in the VC-1 importer probe. Defenders should prioritize verifying versions and assessing exposure.

  • Denial of service through CPU consumption
  • Potential for system hang or crash
  • Need for version verification and patching

Technical summary

The vulnerability is caused by an infinite loop in the vc1_importer_probe() function in importer/vc1_imp.c. This allows attackers to supply a crafted input file, specifically a file consisting only of zero bytes, leading to indefinite CPU consumption and denial of service. The vulnerability can cause denial of service through CPU consumption and potential system hang or crash. Defenders should prioritize verifying versions and assessing exposure. The CVE record and source item provide details about the vulnerability, including its description and potential impact.

Defensive priority

Defenders should prioritize verifying the versions of L-SMASH in use and assessing exposure, as the vulnerability can cause denial of service through CPU consumption.

Recommended defensive actions

  • Verify L-SMASH versions in use and assess exposure
  • Review system logs for potential denial of service attempts
  • Consider applying patches or updates if available
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details about the vulnerability, including its description and potential impact. However, there is limited information about affected versions and remediation. Defenders should verify L-SMASH versions in use and assess exposure. The vulnerability can cause denial of service through CPU consumption and potential system hang or crash.

Sources and references

Verified primary and authoritative sources

  • CVE-2016-20099 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2016-20099

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2016-20099 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2016-20099

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • L-SMASH through 2.14.5 Infinite Loop in VC-1 Importer Probe

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2016/20xxx/CVE-2016-20099.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://github.com/l-smash/l-smash/pull/58

    Supplemental source - patch, issue-tracking

  • Source reference

    Unverified legacy reference

    URL: https://github.com/l-smash/l-smash/blob/v2.14.5/importer/vc1_imp.c

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://hackmd.io/@haind-pwn/l-smash-hevc-importer-double-free

    Supplemental source - third-party-advisory

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/l-smash-through-2.14.5-infinite-loop-in-vc-1-importer-probe

    Supplemental source - third-party-advisory

  • Source reference

    Unverified legacy reference

    URL: https://hackmd.io/@haind-pwn/cve-2016-20099-2026-110599-l-smash-hevc-importer-double-free

    Supplemental source - exploit

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.