---
title: "CVE-2025-43300: Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-43300/
description: "CVE-2025-43300 (Apple iOS, iPadOS, and macOS): Exploited in the wild (CISA KEV). An out-of-bounds write issue was addressed with improved bounds checking.…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-08-21
date_modified: 2026-04-02
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-43300"
kev: true
cvss: 10
epss: 0.3203
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-43300: Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Apple iOS, iPadOS, and macOS. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-08-21, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-09-11 ; treat that as the outer limit, not the target.
- EPSS 32.0% , percentile 98: FIRST’s model estimates a 32.0% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## 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.

## Affected products (CVE record)

- Apple iOS and iPadOS: < 15.8.5, < 16.7.12, < 18.6.2
- Apple iPadOS: < 17.7.10
- Apple macOS: < 13.7.8, < 14.7.8, < 15.6.1

## Severity

- CISA-ADP CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-08-21; federal due date 2025-09-11. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 32.03% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/124925)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/124926)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/124927)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/124928)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/124929)
- [CVE.org record CVE-2025-43300](https://www.cve.org/CVERecord?id=CVE-2025-43300)
- [NVD entry CVE-2025-43300](https://nvd.nist.gov/vuln/detail/CVE-2025-43300)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-43300)
- [support.apple.com](https://support.apple.com/en-us/125141)
- [support.apple.com](https://support.apple.com/en-us/125142)
- [github.com](https://github.com/cisagov/vulnrichment/issues/201)
- [github.com](https://github.com/b1n4r1b01/n-days/blob/main/CVE-2025-43300.md)
- [seclists.org](http://seclists.org/fulldisclosure/2025/Sep/52)
- [seclists.org](http://seclists.org/fulldisclosure/2025/Sep/14)
- [seclists.org](http://seclists.org/fulldisclosure/2025/Sep/10)

---
Source page: https://erroneo.us/security/cve/CVE-2025-43300/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt