Actively exploited in the wild
SIMalliance Toolbox Browser Command Injection Vulnerability
SIMalliance - Toolbox Browser · Listed in the CISA KEV since 2021-11-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2019-16256
CriticalCVSS 9.8KEVSummary
Some Samsung devices include the SIMalliance Toolbox Browser (aka S@T Browser) on the UICC, which might allow remote attackers to retrieve location and IMEI information, or retrieve other data or execute certain commands, via SIM Toolkit (STK) instructions in an SMS message, aka Simjacker.
Risk Assessment
An attacker can remotely track device location, obtain its IMEI and other data, and execute certain commands without the user's knowledge. This poses a serious privacy breach and can be used for surveillance.
Recommendation
Contact your mobile network operator for information on available protections or updates. It is also recommended to use security applications that can detect Simjacker exploitation attempts.
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Original NVD description (English source)
Some Samsung devices include the SIMalliance Toolbox Browser (aka S@T Browser) on the UICC, which might allow remote attackers to retrieve location and IMEI information, or retrieve other data or execute certain commands, via SIM Toolkit (STK) instructions in an SMS message, aka Simjacker.