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Exploited vulnerability · CISA KEV

Is CVE-2021-30900 exploited? Yes: in CISA KEV since 30 Mar 2023

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

Yes. CVE-2021-30900, Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 30 Mar 2023, 583 days after it was published. It affects Apple iOS, iPadOS, and macOS. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 30 Mar 2023
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity7.8CVSS 3.1 · high
US federal due20 Apr 2023BOD 22-01 deadline

What it is

Apple GPU drivers, included in iOS, iPadOS, and macOS, contain an out-of-bounds write vulnerability that may allow a malicious application to execute code with kernel privileges.

VendorApple (96 exploited CVEs in KEV)
ProductiOS, iPadOS, and macOS
VulnerabilityApple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability
WeaknessCWE-20, CWE-787
Published24 Aug 2021
Added to KEV30 Mar 2023
Reported by (CNA)apple

What to do

  1. Check whether you run it. Look for iOS, iPadOS, and macOS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apple CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  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 iOS, iPadOS, and macOS

References

Questions

Is CVE-2021-30900 being exploited?

Yes. CISA added CVE-2021-30900 to the Known Exploited Vulnerabilities catalog on 30 Mar 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-30900 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-2021-30900?

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, iPadOS, and macOS 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 2023 · Apple scorecard · act-now radar.

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