Security readout for executives and security teams
Plain-English summary
A specific Samsung SmartThings Hub firmware version has a serious memory-safety flaw in video handling. A low-privileged attacker who can reach the relevant HTTP interface could trigger a stack buffer overflow, potentially compromising the hub’s confidentiality, integrity, and availability.
Executive priority
Treat as high urgency for environments still using this exact hub and firmware. The issue can affect a home or office automation hub with high impact, but exposure depends on reachable services and firmware inventory.
Technical view
CVE-2018-3903 affects Samsung SmartThings Hub STH-ETH-250 firmware 0.20.17. The video-core process copies a user-controlled JSON url field into a 512-byte stack buffer using memcpy, causing stack overflow and saved program-counter overwrite. CVSS v3.0 is 9.9: network, low complexity, low privileges, no user interaction, changed scope.
Likely exposure
Exposure appears limited to Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17 where the vulnerable HTTP path is reachable by a low-privileged attacker.
Exploitation context
The provided sources describe a triggerable HTTP request and program-counter overwrite, but do not state confirmed real-world exploitation. The CVE is not listed as KEV in the provided bundle.
Researcher notes
The strongest evidence is the Talos advisory and CVE description. The bundle does not provide patch version details, exploit-in-the-wild evidence, or broader affected firmware claims, so validation should stay tightly scoped to STH-ETH-250 firmware 0.20.17.
Mitigation direction
- Identify STH-ETH-250 hubs running firmware 0.20.17.
- Check Samsung or vendor guidance for fixed firmware or replacement direction.
- Restrict hub HTTP access to trusted networks and users only.
- Remove unsupported affected hubs from service if no fixed firmware is available.
Validation and detection
- Inventory SmartThings Hub model and firmware versions.
- Confirm whether vulnerable hub HTTP interfaces are reachable from untrusted networks.
- Review logs for abnormal HTTP requests containing oversized JSON url fields.
- Verify compensating network controls limit access to trusted administrators.
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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CVE-2018-3903 mapping review
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Open ATT&CK lookup- 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
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:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H3.16Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.9CriticalVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0574CVE 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.