Exploited vulnerability · CISA KEV
Is CVE-2021-1905 exploited? Yes: in CISA KEV since 3 Nov 2021
Gociux · Qualcomm Multiple Chipsets · data: CISA KEV, CVE record, FIRST EPSS
Yes. CVE-2021-1905, Qualcomm Multiple Chipsets Use-After-Free Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 180 days after it was published. It affects Qualcomm Multiple Chipsets. If you run it, CISA's required action is: Apply updates per vendor instructions.
exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity8.4CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline
What it is
Multiple Qualcomm Chipsets contain a use after free vulnerability due to improper handling of memory mapping of multiple processes simultaneously.
| Vendor | Qualcomm (12 exploited CVEs in KEV) |
| Product | Multiple Chipsets |
| Vulnerability | Qualcomm Multiple Chipsets Use-After-Free Vulnerability |
| Weakness | CWE-416 |
| Published | 7 May 2021 |
| Added to KEV | 3 Nov 2021 |
| Reported by (CNA) | qualcomm |
What to do
- Check whether you run it. Look for Multiple Chipsets in your asset inventory, including appliances and cloud images. Stack check lists every exploited Qualcomm CVE at once.
- Apply the fix. Apply updates per vendor instructions.
- If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 7 May 2021.
- Get told next time. Email alerts when CISA adds a CVE for Qualcomm.
Other exploited CVEs in Multiple Chipsets
- CVE-2026-21385: Qualcomm Multiple Chipsets Memory Corruption Vulnerability (3 Mar 2026)
- CVE-2025-21479: Qualcomm Multiple Chipsets Incorrect Authorization Vulnerability (3 Jun 2025)
- CVE-2025-21480: Qualcomm Multiple Chipsets Incorrect Authorization Vulnerability (3 Jun 2025)
- CVE-2025-27038: Qualcomm Multiple Chipsets Use-After-Free Vulnerability (3 Jun 2025)
- CVE-2024-43047: Qualcomm Multiple Chipsets Use-After-Free Vulnerability (8 Oct 2024)
- CVE-2023-33107: Qualcomm Multiple Chipsets Integer Overflow Vulnerability (5 Dec 2023)
References
Questions
Is CVE-2021-1905 being exploited?
Yes. CISA added CVE-2021-1905 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.
Is CVE-2021-1905 used in ransomware attacks?
CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.
How do I fix CVE-2021-1905?
Apply updates per vendor instructions. Check Qualcomm's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Multiple Chipsets and watch it for signs of compromise.
Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Qualcomm scorecard · act-now radar.
Running Qualcomm in a regulated environment?
We check exposure across your estate, patch or mitigate with your team, and set up detection for what attackers do after exploiting it.
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