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CVE Record

CVE-2018-3865: An exploitable buffer overflow vulnerability exists in the Samsung WifiScan handler of video-core's HTTP se...

An exploitable buffer overflow vulnerability exists in the Samsung WifiScan handler of video-core's HTTP server of Samsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17. The strcpy overflows the destination buffer, which has a size of 40 bytes. An attacker can send an arbitrarily long "cameraIp" 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

This CVE affects Samsung SmartThings Hub STH-ETH-250 firmware 0.20.17. A flaw in the hub's HTTP server can let a low-privileged network attacker crash or potentially take over the device by abusing an oversized cameraIp value. The business risk is highest where affected hubs remain reachable from untrusted networks.

Executive priority

Treat this as high-priority for environments using the affected SmartThings hub. The device role may seem small, but compromise of an IoT hub can create operational disruption and lateral-movement risk. Prioritize discovery, isolation, and vendor-supported update decisions.

Technical view

The vulnerability is a buffer overflow in the Samsung WifiScan handler in video-core's HTTP server. The source states strcpy copies attacker-controlled cameraIp data into a 40-byte destination buffer. CVSS 3.0 is 9.9: network exploitable, low complexity, low privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is limited to Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17. Risk increases if the hub HTTP service is reachable by untrusted users or broader internal networks. The provided sources do not identify other affected models or firmware versions.

Exploitation context

The CVE record describes the issue as exploitable and network-reachable with low privileges required. The bundle does not include KEV listing or any cited evidence of active exploitation in the wild, so active exploitation should not be assumed.

Researcher notes

Do not broaden scope beyond STH-ETH-250 firmware 0.20.17 without additional evidence. The key primitive is unbounded copying of cameraIp into a 40-byte buffer in the WifiScan handler. Sources provided do not name a fixed version or confirm public weaponization.

Mitigation direction

  • Inventory Samsung SmartThings Hub STH-ETH-250 devices and record firmware versions.
  • Check Samsung and Talos guidance for fixed firmware or vendor-approved mitigations.
  • Upgrade or replace affected firmware when a vendor-supported fix is confirmed.
  • Restrict hub HTTP access to trusted administration networks only.
  • Remove any internet exposure and segment affected IoT devices from critical systems.

Validation and detection

  • Confirm whether any STH-ETH-250 hub runs firmware version 0.20.17.
  • Verify the hub HTTP service is not reachable from untrusted networks.
  • Review vendor advisories for fixed versions before marking remediation complete.
  • Check monitoring for unusual access to SmartThings hub HTTP services.
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-2018-3865 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-2018-3865Attack 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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