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CVE Record

CVE-2018-3874: An exploitable buffer overflow vulnerability exists in the credentials handler of video-core's HTTP server...

An exploitable buffer overflow vulnerability exists in the credentials handler of video-core's HTTP server of Samsung SmartThings Hub STH-ETH-250-Firmware version 0.20.17. The strncpy overflows the destination buffer, which has a size of 32 bytes. An attacker can send an arbitrarily long "accessKey" 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-2018-3874 is a critical buffer overflow in the HTTP credentials handling code of Samsung SmartThings Hub STH-ETH-250 firmware 0.20.17. A user with low privileges could trigger memory corruption remotely, potentially compromising confidentiality, integrity, and availability of the hub.

Executive priority

Treat as urgent only if affected hubs are present. The business risk is device compromise or service disruption in connected environments, but the evidence does not show broad active exploitation.

Technical view

The issue is in video-core's HTTP server credentials handler. The CVE description states an oversized accessKey can overflow a 32-byte destination buffer during strncpy. CVSS 3.0 is 9.9 with network attack vector, low privileges required, no user interaction, changed scope, and high CIA impact.

Likely exposure

Exposure is limited to Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17, based on the source bundle. Risk is higher where the hub's HTTP service is reachable from untrusted networks. The sources do not name other affected firmware versions.

Exploitation context

The source bundle describes the vulnerability as exploitable, but it does not cite active exploitation in the wild. CISA KEV status is false in the provided data, so active exploitation should not be assumed.

Researcher notes

Do not generalize beyond STH-ETH-250 firmware 0.20.17 from these sources. The key technical signal is a fixed-size credentials buffer overflow reachable over the network with low privileges. Patch details are not provided in the source bundle.

Mitigation direction

  • Inventory Samsung SmartThings Hub STH-ETH-250 devices and firmware versions.
  • Check Samsung or vendor guidance for fixed firmware or retirement advice.
  • Restrict hub HTTP access to trusted management networks only.
  • Isolate affected hubs from untrusted or guest network segments.
  • Retire or replace devices if no supported fix is available.

Validation and detection

  • Confirm whether any STH-ETH-250 hubs run firmware 0.20.17.
  • Map which networks can reach the hub HTTP service.
  • Review asset records for legacy SmartThings hubs still in production.
  • Check logs for abnormal credential-handling errors or repeated malformed requests.
  • Verify firmware update status against official Samsung guidance.
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-2018-3874 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-2018-3874Attack 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

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