Exploited vulnerability · CISA KEV

Is CVE-2021-30983 exploited? Yes: in CISA KEV since 27 Jun 2022

Gociux · Apple iOS and iPadOS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-30983, Apple iOS and iPadOS Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 27 Jun 2022, 307 days after it was published. It affects Apple iOS and iPadOS. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 27 Jun 2022

ransomwareNot knownno confirmed use

EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)

severity7.8CVSS 3.1 · high

US federal due18 Jul 2022BOD 22-01 deadline

What it is

Apple iOS and iPadOS contain a buffer overflow vulnerability that could allow an application to execute code with kernel privileges.

Vendor	Apple (96 exploited CVEs in KEV)
Product	iOS and iPadOS
Vulnerability	Apple iOS and iPadOS Buffer Overflow Vulnerability
Weakness	CWE-119
Published	24 Aug 2021
Added to KEV	27 Jun 2022
Reported by (CNA)	apple

What to do

Check whether you run it. Look for iOS and iPadOS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apple 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 24 Aug 2021.
Get told next time. Email alerts when CISA adds a CVE for Apple.

Other exploited CVEs in iOS and iPadOS

CVE-2023-41974: Apple iOS and iPadOS Use-After-Free Vulnerability (5 Mar 2026)
CVE-2025-24200: Apple iOS and iPadOS Incorrect Authorization Vulnerability (12 Feb 2025)
CVE-2023-42824: Apple iOS and iPadOS Kernel Privilege Escalation Vulnerability (5 Oct 2023)
CVE-2022-42827: Apple iOS and iPadOS Out-of-Bounds Write Vulnerability (25 Oct 2022)

References

nvd.nist.gov/vuln/detail/CVE-2021-30983

Questions

Is CVE-2021-30983 being exploited?

Yes. CISA added CVE-2021-30983 to the Known Exploited Vulnerabilities catalog on 27 Jun 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-30983 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-2021-30983?

Apply updates per vendor instructions. Check Apple's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected iOS and iPadOS 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 June 2022 · Apple scorecard · act-now radar.

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