CVE-2021-1905: in the CISA KEV catalogue
Qualcomm Multiple Chipsets Use-After-Free Vulnerability. CISA added CVE-2021-1905 to the Known Exploited Vulnerabilities catalogue on 2021-11-03 with a default due date of 2022-05-03. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Multiple Qualcomm Chipsets contain a use after free vulnerability due to improper handling of memory mapping of multiple processes simultaneously. (CISA description)
- Vendor / product
- Qualcomm Multiple Chipsets
- CWE
- CWE-416
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 1.5%, percentile 74 (scored 2026-11-03)
EPSS puts about 1.5 in 100 odds (1.5%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 74% 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-2021-1905 in the CISA KEV catalogue?
Yes. CISA added CVE-2021-1905 (Qualcomm Multiple Chipsets Use-After-Free Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2021-11-03. CISA's default due date for it is 2022-05-03.
Is CVE-2021-1905 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2021-1905. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2021-1905?
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-2021-1905