CVE-2021-25489: in the CISA KEV catalogue
Samsung Mobile Devices Improper Input Validation Vulnerability. CISA added CVE-2021-25489 to the Known Exploited Vulnerabilities catalogue on 2023-06-29 with a default due date of 2023-07-20. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Samsung mobile devices contain an improper input validation vulnerability within the modem interface driver that results in a format string bug leading to kernel panic. (CISA description)
- Vendor / product
- Samsung Mobile Devices
- CWE
- CWE-20
- CISA required action
- Apply updates per vendor instructions or discontinue use of the product if updates are unavailable
- EPSS
- 0.53%, percentile 44 (scored 2026-11-03)
EPSS puts about 5.3 in 1,000 odds (0.53%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 44% 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-2021-25489 in the CISA KEV catalogue?
Yes. CISA added CVE-2021-25489 (Samsung Mobile Devices Improper Input Validation Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2023-06-29. CISA's default due date for it is 2023-07-20.
Is CVE-2021-25489 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2021-25489. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2021-25489?
CISA's required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable
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-2021-25489