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CVE-2025-43300

Apple iOS, iPadOS, and macOS Out-of-Bounds Write

10.0 CRITICALActively exploited (CISA KEV)Public exploitEPSS 32.5%
  1. Published20 Aug 2025
  2. Added to CISA KEV21 Aug 2025
  3. Remediation due11 Sept 2025
Actively exploited (CISA KEV)

Apple iOS, iPadOS, and macOS contain an out-of-bounds write vulnerability in the Image I/O framework.

Added to KEV: 21 Aug 2025Federal remediation due: 11 Sept 2025

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS 15.8.5, iOS 16.7.12 and iPadOS 16.7.12, iOS 18.6.2 and iPadOS 18.6.2, iPadOS 17.7.10, macOS Sequoia 15.6.1, macOS Sonoma 14.7.8, macOS Ventura 13.7.8. Processing a malicious image file may result in memory corruption. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Apple iPadOS≥ 16.0 < 16.7.12 · ≥ 17.0 < 17.7.10 · ≥ 18.0 < 18.6.2 · < 15.8.5
Apple iPhone OS≥ 16.0 < 16.7.12 · ≥ 17.0 < 18.6.2 · < 15.8.5
Apple macOS≥ 13.0 < 13.7.8 · ≥ 14.0 < 14.7.8 · ≥ 15.0 < 15.6.1

Remediation

Fixed in
Apple iPadOS≥ 16.7.12
Apple iPhone OS≥ 16.7.12
Apple macOS≥ 13.7.8

References

and 3 more references

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Frequently asked

Is CVE-2025-43300 being actively exploited?

Yes. CVE-2025-43300 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 21 Aug 2025.

How severe is CVE-2025-43300?

CVE-2025-43300 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 32.5% probability of exploitation.

Which products are affected by CVE-2025-43300?

Affected products include Apple iPadOS, Apple iPhone OS, Apple macOS.

How do I fix CVE-2025-43300?

Upgrade affected software to a fixed version, for example Apple iPadOS 16.7.12, Apple iPhone OS 16.7.12, Apple macOS 13.7.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-43300 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.