CVE-2018-3903

Name: CVE-2018-3903
Creator: NVD / NIST
Published: 2018-08-23T15:29:01.21+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.9/10EPSS 1.80%

Last modified Jun 17, 2026

CVE-2018-3903 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. On Samsung SmartThings Hub STH-ETH-250 devices with 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. An attacker can send an HTTP request to trigger this vulnerability. EPSS estimates a 1.80% chance of exploitation in the next 30 days.

Description

On Samsung SmartThings Hub STH-ETH-250 devices with 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. An attacker can send an HTTP request to trigger this vulnerability. The memcpy call overflows the destination buffer, which has a size of 512 bytes. An attacker can send an arbitrarily long "url" value in order to overwrite the saved-PC with 0x42424242.

Metrics

CVSS 3.1

9.9/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

1.80%

75.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Samsung	Sth-Eth-250 Firmware	0.20.17

References

https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0574Exploit, Third Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0574Exploit, Third Party Advisory

Timeline

Published: Aug 23, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-3903?

How severe is CVE-2018-3903?

CVE-2018-3903 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 1.80% probability of exploitation in the next 30 days.

How do I fix CVE-2018-3903?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-3903?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST