CVE-2021-25337: in the CISA KEV catalogue
Samsung Mobile Devices Improper Access Control Vulnerability. CISA added CVE-2021-25337 to the Known Exploited Vulnerabilities catalogue on 2022-11-08 with a default due date of 2022-11-29. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Samsung mobile devices contain an improper access control vulnerability in clipboard service which allows untrusted applications to read or write arbitrary files. This vulnerability was chained with CVE-2021-25369 and CVE-2021-25370. (CISA description)
- Vendor / product
- Samsung Mobile Devices
- CWE
- CWE-269
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 2.8%, percentile 86 (scored 2026-11-03)
EPSS puts about 2.8 in 100 odds (2.8%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 86% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2021-25337 in the CISA KEV catalogue?
Yes. CISA added CVE-2021-25337 (Samsung Mobile Devices Improper Access Control Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-11-08. CISA's default due date for it is 2022-11-29.
Is CVE-2021-25337 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2021-25337. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2021-25337?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2021-25337