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CVE Record

CVE-2018-3875: 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 video-core process incorrectly extracts fields from a user-controlled JSON payload, leading to a buffer overflow on the stack. The strncpy overflows the destination buffer, which has a size of 2,000 bytes. An attacker can send an arbitrarily long "sessionToken" 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 network attacker with low privileges could abuse a credentials-handling request to crash or potentially control the vulnerable process. The sources identify firmware 0.20.17 only.

Executive priority

Treat as urgent for any deployed affected hub, especially in business networks. Confirm exposure first; if present, isolate the device and follow vendor remediation guidance.

Technical view

CVE-2018-3875 affects video-core's HTTP server credentials handler on Samsung SmartThings Hub STH-ETH-250 firmware 0.20.17. The handler copies a user-controlled JSON sessionToken into a 2,000-byte stack buffer with unsafe bounds handling, causing a stack buffer overflow. CVSS is 9.9 with network access, low privileges, and no user interaction.

Likely exposure

Exposure is limited to environments with Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17. Risk is higher where hub HTTP services are reachable from untrusted networks or shared internal networks.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation evidence. The CVSS vector indicates exploitation is network-reachable, low-complexity, and requires low privileges, but no user interaction.

Researcher notes

Evidence is strong for the vulnerable component and affected version, but incomplete for fixed versions, mitigations, and exploitation in the wild. Avoid broadening affected products beyond STH-ETH-250 firmware 0.20.17.

Mitigation direction

  • Inventory SmartThings Hub STH-ETH-250 devices and firmware versions.
  • Check Samsung guidance for fixed firmware or supported replacement options.
  • Restrict hub management and HTTP access to trusted network segments.
  • Remove direct internet exposure for affected hubs.
  • Monitor for abnormal credential-handling requests and process crashes.

Validation and detection

  • Confirm whether any STH-ETH-250 hub runs firmware 0.20.17.
  • Map which networks can reach hub HTTP services.
  • Review asset records for retired but still connected SmartThings hubs.
  • Check security logs for repeated credential-handler errors or crashes.
  • Track vendor advisories because the bundle does not name a fixed version.
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-2018-3875 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-2018-3875Attack 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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