Local code execution via externally controlled format strings
Published Feb 9, 2023 · Updated Mar 24, 2025
Externally controlled format strings in STST TA on Samsung Android 10 and 11 Teegris devices allow local users to execute arbitrary code. The trusted application passes attacker-controlled formatting data to a print path; its patch restricts when external format strings can trigger printing. Local low-privileged access is required, and successful exploitation executes code within the STST trusted-application context.
Summary
What happened
Externally controlled format strings in STST TA on Samsung Android 10 and 11 Teegris devices allow local users to execute arbitrary code. The trusted application passes attacker-controlled formatting data to a print path; its patch restricts when external format strings can trigger printing. Local low-privileged access is required, and successful exploitation executes code within the STST trusted-application context.
The record
- CVE
- CVE-2023-21420
- Published
- Feb 9, 2023
- Updated
- Mar 24, 2025
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Samsung Mobile Devices
- Classifications
- CWE-134
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 9, 2023CVE publishedPublication date reported by the CVE source.
- Mar 24, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Q(10), R(11) devices with Teegris <SMR Jan-2023 Release 1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo