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

Patch now

CRITICAL 9.8EXPLOITEDREMOTEMITIGATE

CVE-2019-16256 is a critical-severity flaw (CVSS 9.8) affecting s\@t browser, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Exploited in the wild (CISA KEV)
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.9% (top 8%)
CISA exploited list	Yes, fix due 2022-05-03
Published	2019-09-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: trustedconnectivityalliance

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-09-12 13:15 UTCPublished CVE record published
2021-11-03Exploited Added to the CISA Known Exploited Vulnerabilities list
2022-05-03Deadline CISA due date for US federal agencies to patch
2026-06-17 02:22 UTCUpdated Record last modified

trustedconnectivityalliance s\@t browser MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy st-browser || rpm -q st-browser || st-browser --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · python-discovery · FIXED · 1.9.0-1.eln159 · FEDORA-2026-7a881c0c99 · source

sudo dnf upgrade --advisory=FEDORA-2026-7a881c0c99

Fedora 46 · pipx · FIXED · 1.18.11-1.fc46 · FEDORA-2026-443a765287 · source

sudo dnf upgrade --advisory=FEDORA-2026-443a765287

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-16256?

s\@t browser: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-16256 being exploited?

Yes. CVE-2019-16256 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2019-16256 affect?

CVE-2019-16256 affects s\@t browser. Severity is critical (CVSS 9.8). 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 (S

How urgent is CVE-2019-16256?

Priority 95/100. Critical severity; EPSS top 8%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Samsung vulnerabilities

References

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