CVE Record
[ HIGH ]CVE-2021-30983
Apple iOS and iPadOS Buffer Overflow Vulnerability
Apple iOS and iPadOS contain a buffer overflow vulnerability that could allow an application to execute code with kernel privileges.
- Vendor
- Apple
- Product
- iOS and iPadOS
- CVSS
- 7.8
- EPSS (exploit probability)
- 2.9%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2021-30983 being exploited?
Yes. CISA added CVE-2021-30983 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 2.9% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Apple iOS and iPadOS CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2023-41974 Apple iOS and iPadOS Use-After-Free Vulnerability | [ HIGH ] | 7.8 | 2.0% | |
| CVE-2025-24200 Apple iOS and iPadOS Incorrect Authorization Vulnerability | [ MEDIUM ] | 6.1 | 4.4% | |
| CVE-2023-42824 Apple iOS and iPadOS Kernel Privilege Escalation Vulnerability | [ HIGH ] | 7.8 | 1.0% | |
| CVE-2022-42827 Apple iOS and iPadOS Out-of-Bounds Write Vulnerability | [ HIGH ] | 7.8 | 1.1% |