Known exploited vulnerability
CVE-2025-43300
The short answer
CVE-2025-43300 affects Apple iOS and iPadOS and is rated critical (CVSS 10.0). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-08-21: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-787.
Severity
10.0 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Aug 21, 2025
Federal due date Sep 11, 2025
EPSS, next 30 days
65%
Higher than 99% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
iOS and iPadOS, iPadOS, macOS. NVD's record lists the exact affected versions.
References
- support.apple.com/en-us/124925 Release NotesVendor Advisory
- support.apple.com/en-us/124926 Release NotesVendor Advisory
- support.apple.com/en-us/124927 Release NotesVendor Advisory
- support.apple.com/en-us/124928 Release NotesVendor Advisory
- support.apple.com/en-us/124929 Release NotesVendor Advisory
- support.apple.com/en-us/125141 Release NotesVendor Advisory
- support.apple.com/en-us/125142 Release NotesVendor Advisory
- github.com/b1n4r1b01/n-days/blob/main/CVE-2025-43300.md ExploitThird Party Advisory
- github.com/cisagov/vulnrichment/issues/201 Issue Tracking
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-43300 US Government Resource
Questions
Is CVE-2025-43300 being exploited?
Yes. CISA added CVE-2025-43300 to its Known Exploited Vulnerabilities catalog on 2025-08-21, with a federal remediation due date of 2025-09-11.
How do I fix CVE-2025-43300?
CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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