Which products and versions are affected by CVE-2019-16256?

Affected: S\@t Browser (Trustedconnectivityalliance). The full list is in the CVE brief.

Is CVE-2019-16256 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021.

Is CVE-2019-16256 in the CISA KEV catalog?

Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.

Is there a public exploit for CVE-2019-16256?

Public exploit code is available.

Is there a fix for CVE-2019-16256?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2019-16256 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2019-16256

CriticalExploitedPublic exploit

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…

Published Sep 12, 2019 · Updated Nov 12, 2025

Key Facts

Patch immediately

CVE-2019-16256 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting S\@t Browser (Trustedconnectivityalliance).
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021. Public exploit code is available.
EPSS estimates a 4.9% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

4.9%

Higher than 92.0% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2019-16256 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Nov 3, 2021	May 3, 2022	Not reported
Industry KEV feed	Nov 3, 2021	May 3, 2022	Not reported
CIRCL KEV	Nov 3, 2021	May 3, 2022	Not reported
ENISA EUVD	Nov 3, 2021	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
S\@t BrowserTrustedconnectivityalliance	See advisory	n/a

Timeline

Publicly disclosed
Sep 12, 2019
Added to CISA KEV
Nov 3, 2021
Added to Industry KEV feed
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Nov 12, 2025

References

FAQ

Common Questions.

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.
Affected: S\@t Browser (Trustedconnectivityalliance). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2019-16256 Running On Your Attack Surface?

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