# CVE-2019-16256: SIMalliance Toolbox Browser Command Injection Vulnerability

Source: https://junglewise.ai/threats/cve-2019-16256-simalliance-toolbox-browser-command-injection-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2019-16256 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

The SIMalliance Toolbox Browser (S@T Browser) on certain UICCs, notably in Samsung devices, contains a command injection vulnerability known as Simjacker. Remote attackers can execute SIM Toolkit (STK) instructions via specially crafted SMS messages to retrieve sensitive location and IMEI information or execute other unauthorized commands.

## Quick answers

**Is CVE-2019-16256 exploited in the wild?** Yes. CVE-2019-16256 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2019-16256?** Critical severity, with a CVSS score of 9.8, published 3 November 2021.

**Which products and versions are affected?** Trusted Connectivity Alliance S@T Browser (SIMalliance Toolbox Browser) -; Samsung Samsung Devices -.

**Is there a fix for CVE-2019-16256?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2019-16256 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2019-16256?** Check whether you run Simalliance Toolbox Browser. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Trusted Connectivity Alliance S@T Browser (SIMalliance Toolbox Browser) -
- Samsung Samsung Devices -

## Timeline

- 2019-09-12: disclosed: NVD Published Date
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2019-09-12: exploited: Simjacker attack reported as exploited in the wild.