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Exploited vulnerability · CISA KEV

Is CVE-2021-30952 exploited? Yes: in CISA KEV since 5 Mar 2026

Gociux · Apple Multiple Products · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-30952, Apple Multiple Products Integer Overflow or Wraparound Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 5 Mar 2026, 1654 days after it was published. It affects Apple Multiple Products. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 5 Mar 2026
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity8.8CVSS 3.1 · high
US federal due26 Mar 2026BOD 22-01 deadline

What it is

Apple tvOS, macOS, Safari, iPadOS and watchOS contain an integer overflow or wraparound vulnerability due to the processing of maliciously crafted web content that may lead to arbitrary code execution.

VendorApple (96 exploited CVEs in KEV)
ProductMultiple Products
VulnerabilityApple Multiple Products Integer Overflow or Wraparound Vulnerability
WeaknessCWE-190
Published24 Aug 2021
Added to KEV5 Mar 2026
Reported by (CNA)apple

What to do

  1. Check whether you run it. Look for Multiple Products in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apple CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. 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.
  4. Get told next time. Email alerts when CISA adds a CVE for Apple.

Other exploited CVEs in Multiple Products

References

Questions

Is CVE-2021-30952 being exploited?

Yes. CISA added CVE-2021-30952 to the Known Exploited Vulnerabilities catalog on 5 Mar 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-30952 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-2021-30952?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Apple's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Multiple Products 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 March 2026 · Apple scorecard · act-now radar.

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