Apple · iOS and iPadOS
CVE-2021-30983
Apple iOS and iPadOS Buffer Overflow Vulnerability
Exploited in attacks
High 7.8 Attack chance: 2.9%
What it is
A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 15.2 and iPadOS 15.2. An application may be able to execute arbitrary code with kernel privileges.
CISA: Apple iOS and iPadOS contain a buffer overflow vulnerability that could allow an application to execute code with kernel privileges.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: July 18, 2022
- Added to the CISA list
- June 27, 2022
- Published
- August 24, 2021
- Severity
- High 7.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 2.9% in the top 13.0% of all known vulnerabilities
- Weakness
- CWE-119
- More details
- NVD · CVE.org · CISA
All references (1)
More exploited flaws from Apple
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Mar 5, 2026 | Use-After-Free | iOS and iPadOS | High 7.8 | 2.0% |
| Feb 12, 2025 | Incorrect Authorization | iOS and iPadOS | Medium 6.1 | 4.5% |
| Oct 5, 2023 | Kernel Privilege Escalation | iOS and iPadOS | High 7.8 | 1.0% |
| Oct 25, 2022 | Out-of-Bounds Write | iOS and iPadOS | High 7.8 | 1.1% |
| Sep 29, 2026 | Out-of-Bounds Write | Multiple Products | High 8.8 | 26% |
| Aug 18, 2026 | Improper Authentication | macOS | Critical 9.8 | 1.7% |
| Mar 20, 2026 | Buffer Overflow | Multiple Products | High 8.8 | 1.7% |
| Mar 20, 2026 | Improper Locking | Multiple Products | High 7.8 | 0.4% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.