CVE-2021-0920: in the CISA KEV catalogue
Android Kernel Race Condition Vulnerability. CISA added CVE-2021-0920 to the Known Exploited Vulnerabilities catalogue on 2022-05-23 with a default due date of 2022-06-13. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Android kernel contains a race condition, which allows for a use-after-free vulnerability. Exploitation can allow for privilege escalation. (CISA description)
- Vendor / product
- Android Kernel
- CWE
- CWE-362, CWE-416
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 0.87%, percentile 58 (scored 2026-11-03)
EPSS puts about 8.7 in 1,000 odds (0.87%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 58% of scored CVEs. Most CVEs score under 1%, so a high percentile can sit on a small probability: read the percentage first.
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-2021-0920 in the CISA KEV catalogue?
Yes. CISA added CVE-2021-0920 (Android Kernel Race Condition Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-05-23. CISA's default due date for it is 2022-06-13.
Is CVE-2021-0920 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2021-0920. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2021-0920?
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-2021-0920