Security readout for executives and security teams
Plain-English summary
CVE-2018-3914 is a memory corruption flaw in a Samsung SmartThings Hub firmware version. A specially oversized session token can overflow a fixed stack buffer in the hub's video-core HTTP server, potentially allowing serious compromise if an attacker can meet the access and privilege conditions.
Executive priority
Treat this as high priority where affected hubs are deployed on trusted or sensitive networks. The business risk is highest when IoT devices can bridge into corporate systems, but available evidence does not support emergency active-exploitation handling.
Technical view
The flaw is a stack-based buffer overflow in Samsung SmartThings Hub STH-ETH-250 firmware 0.20.17. During database field retrieval, a strcpy operation copies an attacker-controlled sessionToken into a 2000-byte destination buffer without adequate bounds enforcement. The CVSS vector indicates local access, high complexity, and high privileges.
Likely exposure
Exposure appears limited to Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17. The provided sources do not identify other models, later firmware versions, internet exposure requirements, or fleet prevalence.
Exploitation context
The source bundle states the flaw is exploitable, but CISA KEV status is false and no cited source states active exploitation. The CVSS vector suggests exploitation is constrained by local access, high complexity, and high privileges, despite high confidentiality, integrity, and availability impact.
Researcher notes
Key evidence is narrow: one affected model and firmware version, a specific strcpy overflow path, and CVSS 7.5. The bundle does not provide a patch version, exploitation-in-the-wild evidence, or broader affected-version ranges, so scope should remain conservative.
Mitigation direction
- Inventory SmartThings Hub STH-ETH-250 devices and identify firmware version 0.20.17.
- Check Samsung and Talos guidance for fixed firmware or supported mitigation details.
- Restrict local network access to hub management and video-core HTTP interfaces.
- Segment IoT hubs away from sensitive business systems and administrative workstations.
- Retire or replace unsupported affected hubs if no vendor fix is available.
Validation and detection
- Confirm whether any SmartThings Hub STH-ETH-250 runs firmware 0.20.17.
- Review network controls limiting local access to the affected hub services.
- Check asset records for SmartThings hubs connected to corporate or executive networks.
- Look for vendor firmware update evidence before closing remediation tickets.
- Do not validate using oversized tokens against production devices.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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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Database behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-3914 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H0.86Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.5HighVector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2018-0581CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.