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CVE Record

CVE-2018-3909: An exploitable vulnerability exists in the REST parser of video-core's HTTP server of the Samsung SmartThin...

An exploitable vulnerability exists in the REST parser of video-core's HTTP server of the Samsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17. The video-core process incorrectly handles pipelined HTTP requests, which allows successive requests to overwrite the previously parsed HTTP method, 'onmessagecomplete' callback. An attacker can send an HTTP request to trigger this vulnerability.

CriticalCVSS 9.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

This issue affects Samsung SmartThings Hub STH-ETH-250 firmware 0.20.17. A network attacker can send crafted HTTP traffic to the hub's video-core HTTP server and corrupt request parsing, potentially affecting integrity and availability. The provided sources do not show current exploitation.

Executive priority

Treat as urgent for environments still operating this hub firmware, especially if IoT networks are flat or reachable by guests. The main business risk is device compromise affecting automation integrity and service availability, not confirmed data theft from the CVSS vector.

Technical view

The REST parser in video-core mishandles pipelined HTTP requests. Successive requests can overwrite the previously parsed HTTP method and onmessagecomplete callback, with high integrity and availability impact. CVSS 3.0 is 9.1: network, low complexity, no privileges, no user interaction.

Likely exposure

Exposure is limited to Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17 where the video-core HTTP server is reachable. The bundle does not identify other models, later firmware, or internet-wide prevalence.

Exploitation context

The CVE and Talos report describe network-triggerable exploitation through HTTP request handling. The CVE is not marked KEV in the supplied bundle, and no provided source states active exploitation in the wild.

Researcher notes

The source bundle provides the core parser flaw and CVSS vector but no exploit maturity, patch version, or broad affected-version range. Avoid expanding scope beyond STH-ETH-250 firmware 0.20.17 without vendor evidence.

Mitigation direction

  • Inventory Samsung SmartThings Hub STH-ETH-250 devices and firmware versions.
  • Check Samsung or SmartThings vendor guidance for fixed firmware or replacement direction.
  • Restrict network access to hub management and local services.
  • Block untrusted access to the video-core HTTP service where possible.
  • Prioritize segmentation for IoT networks containing affected hubs.

Validation and detection

  • Confirm whether any hub runs firmware version 0.20.17.
  • Verify whether the video-core HTTP server is reachable from untrusted networks.
  • Review firewall and segmentation rules around SmartThings hub subnets.
  • Check vendor advisories or device update status for remediation availability.
  • Monitor logs for unusual HTTP errors or unexpected hub restarts.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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CVE-2018-3909 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.1 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.1CVSS 3.0CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H3.95.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

9.1Critical
CVSS 3.0 vector shape for CVE-2018-3909Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
TalosSamsungSamsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.