CVE-2016-20099

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 14.5% of scored records. A rank, not a probability.

NVD base score

6.8 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-16.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-10-14 14:16Z14 DAYS AGO

Last updated

2026-10-14 17:44Z14 DAYS AGO

Reserved

2026-10-14

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Medium (CVSS 6.8)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')Base

Data version

5.2

Document digest

7f4b309b46f86de6e64e09332cefc584b444fb4376aa73d294e3bad48c762e2f

• github.comhttps://github.com/l-smash/l-smash/pull/58patchissue-tracking
• github.comhttps://github.com/l-smash/l-smash/blob/v2.14.5/importer/vc1_imp.c#L462-L488technical-description
• hackmd.iohttps://hackmd.io/@haind-pwn/l-smash-hevc-importer-double-freethird-party-advisory
• www.vulncheck.comVulnCheck Advisory: L-SMASH through 2.14.5 Infinite Loop in VC-1 Importer Probehttps://www.vulncheck.com/advisories/l-smash-through-2.14.5-infinite-loop-in-vc-1-importer-probethird-party-advisory
• hackmd.iohttps://hackmd.io/@haind-pwn/cve-2016-20099-2026-110599-l-smash-hevc-importer-double-freeexploit