CVE-2018-3866
CVE-2018-3866 is a critical-severity vulnerability in Samsung Sth-eth-250 Firmware with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Critical (CVSS 3.x base score 9.9)
- CVSS v2: 9.0
- EPSS exploit prediction: 2% (72nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-787
- Affected product: Samsung Sth-eth-250 Firmware
- Published:
- Last modified:
Description
An exploitable buffer overflow vulnerability exists in the samsungWifiScan 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 strcpy at [8] overflows the destination buffer, which has a size of 40 bytes. An attacker can send an arbitrarily long 'callbackUrl' value in order to exploit this vulnerability.
Frequently asked questions
- What is CVE-2018-3866?
- An exploitable buffer overflow vulnerability exists in the samsungWifiScan 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 strcpy at [8] overflows the destination buffer, which has a size of 40 bytes. An attacker can send an arbitrarily long 'callbackUrl' value in order to exploit this vulnerability.
- How severe is CVE-2018-3866?
- CVE-2018-3866 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2018-3866 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2018-3866?
- CVE-2018-3866 affects Samsung Sth-eth-250 Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2018-3866?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2018-3866 published?
- CVE-2018-3866 was published on 2018-08-23 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:samsung:sth-eth-250_firmware:0.20.17:*:*:*:*:*:*:*
More vulnerabilities in Samsung Sth-eth-250 Firmware
- CVE-2018-3907 — Critical (CVSS 10.0): An exploitable vulnerability exists in the REST parser of video-core's HTTP server of the Samsung SmartThings Hub…
- CVE-2018-3877 — Critical (CVSS 9.9): An exploitable buffer overflow vulnerability exists in the credentials handler of video-core's HTTP server of Samsung…
- CVE-2018-3874 — Critical (CVSS 9.9): An exploitable buffer overflow vulnerability exists in the credentials handler of video-core's HTTP server of Samsung…
- CVE-2018-3873 — Critical (CVSS 9.9): An exploitable buffer overflow vulnerability exists in the credentials handler of video-core's HTTP server of Samsung…
- CVE-2018-3875 — Critical (CVSS 9.9): An exploitable buffer overflow vulnerability exists in the credentials handler of video-core's HTTP server of Samsung…
- CVE-2018-3904 — Critical (CVSS 9.9): An exploitable buffer overflow vulnerability exists in the camera 'update' feature of video-core's HTTP server of…
All CVEs affecting Samsung Sth-eth-250 Firmware →
Other CWE-787 (Out-of-bounds Write) vulnerabilities
- CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
- CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src modules). This vulnerability is…
- CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
- CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
- CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
- CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…