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CVE Record

CVE-2018-3873: 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 128 bytes. An attacker can send an arbitrarily long "secretKey" 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 is a critical memory corruption flaw in a Samsung SmartThings Hub firmware component. A low-privileged network attacker could crash or potentially control the affected hub by abusing its HTTP credential handling. The provided sources name only STH-ETH-250 firmware 0.20.17 as affected.

Executive priority

Treat as urgent only if affected hubs are present. If found, prioritize isolation and remediation because the rated impact is critical and the device may bridge physical or IoT workflows into business networks.

Technical view

CVE-2018-3873 is a buffer overflow in video-core HTTP server credential handling. The described issue is an unsafe strncpy into a 128-byte destination buffer when processing the secretKey value. CVSS 3.0 is 9.9 with network attack vector, low complexity, low privileges, no user interaction, scope changed, and high CIA impact.

Likely exposure

Exposure is limited to Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17, especially where the hub HTTP service is reachable from untrusted networks or shared internal segments.

Exploitation context

The CVE is not listed as KEV in the provided bundle, and no supplied source states active exploitation. The issue is still serious because exploitation is network-based, low complexity, and may affect confidentiality, integrity, and availability.

Researcher notes

The source bundle supports a narrow affected scope and a specific overflow condition, but does not provide remediation details or active exploitation evidence. Avoid broad SmartThings assumptions beyond STH-ETH-250 firmware 0.20.17 unless confirmed by vendor data.

Mitigation direction

  • Inventory Samsung SmartThings Hub STH-ETH-250 devices and firmware versions.
  • Check Samsung or vendor guidance for fixed firmware, replacement, or support status.
  • Restrict hub HTTP access to trusted management networks only.
  • Segment SmartThings hubs away from sensitive enterprise systems.
  • Retire or replace affected devices if no supported remediation exists.
  • Monitor for unusual credential-handling or hub HTTP activity.

Validation and detection

  • Confirm whether any STH-ETH-250 hubs are present.
  • Verify whether firmware version 0.20.17 is installed.
  • Review firewall rules for hub HTTP service reachability.
  • Check logs for abnormal requests targeting credential handling.
  • Document vendor guidance, remediation decision, and residual exposure.
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-2018-3873 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-2018-3873Attack 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.