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CVE Record

CVE-2018-3908: 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, URL and body. With the implementation of the on_body callback, defined by sub_41734, 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 flaw affects Samsung SmartThings Hub STH-ETH-250 firmware 0.20.17. A network attacker could abuse the hub’s video-core HTTP REST parser to corrupt how requests are interpreted, potentially changing device behavior or disrupting service without authentication or user interaction.

Executive priority

Prioritize remediation for any affected hub reachable by guests, IoT networks, corporate users, or the internet. Business urgency is highest where SmartThings hubs control security, access, automation, or operational devices.

Technical view

The video-core HTTP server mishandles pipelined HTTP requests. Successive requests can overwrite the previously parsed HTTP method, URL, and body, affecting REST parser state. CVSS 3.0 is 9.1 with network attack vector, low complexity, no privileges, no user interaction, high integrity impact, and high availability impact.

Likely exposure

Exposure is limited to Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17, especially where the hub’s HTTP service is reachable from untrusted networks. The provided sources do not identify other affected products or versions.

Exploitation context

The CVE and Talos reference describe the issue as exploitable, but the provided bundle does not cite active exploitation, public exploitation, or CISA KEV inclusion. Treat this as high-risk due to unauthenticated network reachability and critical integrity and availability impact.

Researcher notes

Evidence is strongest for firmware 0.20.17 on STH-ETH-250. The root issue is parser state corruption across pipelined HTTP requests. The bundle does not provide a fixed version, exploit telemetry, or broader affected-version range.

Mitigation direction

  • Inventory SmartThings Hub STH-ETH-250 devices and record firmware versions.
  • Check Samsung or SmartThings guidance for fixed firmware or supported remediation.
  • Update affected firmware if a vendor-approved update is available.
  • Restrict hub HTTP access to trusted local management networks only.
  • Block internet exposure and untrusted lateral access to affected hubs.

Validation and detection

  • Confirm whether any SmartThings Hub STH-ETH-250 runs firmware 0.20.17.
  • Verify the hub HTTP service is not exposed to the internet.
  • Review firewall and segmentation rules protecting hub management traffic.
  • Check monitoring for unexpected HTTP activity targeting hub services.
  • Document remediation status and any vendor guidance followed.
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-2018-3908 mapping review

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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-2018-3908Attack 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
SamsungSamsungSamsung 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.