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CVE Record

CVE-2018-3894: An exploitable buffer overflow vulnerability exists in the /cameras/XXXX/clips handler of video-core's HTTP...

An exploitable buffer overflow vulnerability exists in the /cameras/XXXX/clips handler of video-core's HTTP server of Samsung SmartThings Hub STH-ETH-250-Firmware version 0.20.17. The strncpy call overflows the destination buffer, which has a size of 52 bytes. An attacker can send an arbitrarily long "startTime" value in order to exploit this vulnerability.

CriticalCVSS 9.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2018-3894 is a critical memory corruption flaw in Samsung SmartThings Hub STH-ETH-250 firmware 0.20.17. A low-privileged network attacker could trigger a buffer overflow in the hub’s video-core HTTP service, potentially compromising confidentiality, integrity, and availability.

Executive priority

Prioritize as critical where affected hubs remain deployed, especially in corporate, guest, or exposed networks. Business risk is device takeover or service disruption from a network path with limited privileges required.

Technical view

The issue is in the /cameras/XXXX/clips handler of video-core’s HTTP server. The source describes an unsafe strncpy into a 52-byte destination buffer using an attacker-controlled startTime value. CVSS 3.0 rates it 9.9 with network access, low complexity, low privileges, no user interaction, and high impact.

Likely exposure

Exposure appears limited to Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17 with the affected video-core HTTP service reachable to an attacker who has low privileges.

Exploitation context

The bundle says the flaw is exploitable, but does not provide evidence of active exploitation. CISA KEV status is false in the provided data. Treat internet or untrusted-network reachability as the main urgency driver.

Researcher notes

The provided evidence identifies one affected product and firmware version only. Do not generalize to other SmartThings models or firmware without vendor evidence. The key technical condition is attacker-controlled startTime reaching the vulnerable clips handler.

Mitigation direction

  • Identify STH-ETH-250 hubs and record firmware versions.
  • Check Samsung or SmartThings guidance for fixed firmware or supported replacement paths.
  • Restrict network access to SmartThings hub management and video-core services.
  • Remove affected hubs from untrusted or internet-reachable network segments.
  • Prioritize replacement if no supported vendor fix is available.

Validation and detection

  • Inventory SmartThings Hub STH-ETH-250 devices in asset records and network scans.
  • Confirm whether firmware version 0.20.17 is present.
  • Verify the affected HTTP service is not reachable from untrusted networks.
  • Review access controls for users or integrations with low privileges.
  • Document remediation status and remaining compensating controls.
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.

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CVE-2018-3894 mapping review

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.9 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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
9.9CVSS 3.0CriticalCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H3.16Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

9.9Critical
CVSS 3.0 vector shape for CVE-2018-3894Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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
SamsungSmartThings Hub STH-ETH-250Firmware version 0.20.17Listed
Weakness

CWE details

No CWE listed

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