How severe is CVE-2019-16256?

CVE-2019-16256 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-16256 being actively exploited?

Yes. CVE-2019-16256 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2019-16256?

CVE-2019-16256 affects Trustedconnectivityalliance S@t Browser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-16256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2019-16256 have an EU (EUVD) identifier?

Yes. CVE-2019-16256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-7062. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2019-16256 published?

CVE-2019-16256 was published on 2019-09-12 and last updated on 2026-06-17.

CVE-2019-16256

CVE-2019-16256 is a critical-severity vulnerability in Trustedconnectivityalliance S@t Browser with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03).

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
EU (EUVD) id: EUVD-2019-7062
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
Affected product: Trustedconnectivityalliance S@t Browser
Published: 2019-09-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2019-16256?: 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.
How severe is CVE-2019-16256?: CVE-2019-16256 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-16256 being actively exploited?: Yes. CVE-2019-16256 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2019-16256?: CVE-2019-16256 affects Trustedconnectivityalliance S@t Browser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-16256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2019-16256 have an EU (EUVD) identifier?: Yes. CVE-2019-16256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-7062. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2019-16256 published?: CVE-2019-16256 was published on 2019-09-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:trustedconnectivityalliance:s\@t_browser:-:*:*:*:*:*:*:*