vulnerability

CVE-2025-43300

10.0

Critical

KEV · Exploited in wildEPSS 65%Patch available

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.

exploited

Yes, in CISA KEV since 21 Aug 2025fix by 11 Sept 2025 (CISA deadline for US federal agencies)unvetted proof-of-concept code on github

fix

Patch available see the advisory in the references

likelihood

EPSS 65.2%

Published 21 Aug 2025Analysed here 2 Nov 2026CVSS scored by CISA

do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

triage

server-sideruntimeWAF can block: noAV · networkCWE-787· Out-of-Bounds Write

Can a WAF block it? No. The vulnerability is triggered by processing a malicious image file, which requires the victim to open or load the file locally. This does not involve HTTP requests, so a web application firewall cannot filter or block the attack.

Also consider: patch

Based on an AI reading of the CVE description, and no vendor rule found yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

cvss vector

attack vectornetworkattack complexitylowprivileges requirednoneuser interactionnonescopechangedconfidentialityhighintegrityhighavailabilityhigh

CVSS 3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

common questions

Is CVE-2025-43300 being exploited?

Yes. CVE-2025-43300 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.

How severe is CVE-2025-43300?

CVE-2025-43300 is rated Critical with a CVSS score of 10.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2025-43300?

Yes. A fix has been recorded for CVE-2025-43300. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2025-43300 affect?

CVE-2025-43300 affects apple:ipados, apple:iphone_os, apple:macos. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary

technical analysis

affected

apple:ipadosapple:iphone_osapple:macos

affected versions

Apple iOS and iPadOS

affected< 15.8.5
affected< 16.7.12
affected< 18.6.2

Apple iPadOS

affected< 17.7.10

Apple macOS

affected< 13.7.8
affected< 14.7.8
affected< 15.6.1

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

public exploits

Unvetted proof-of-concept code on GitHub: 5 GitHub proofs of concept

GitHub proofs of concept

+1 more repositories

Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.

cisa ssvc

exploitation: active
automatable: yes
technical impact: total

Assessed by CISA 27 Nov 2025 (SSVC 2.0.3).

timeline

21 Aug 2025Added to CISA KEV (exploited in the wild)
21 Aug 2025Published · same day later
24 Aug 2025First proof-of-concept repository on GitHub (unvetted) · 3 days later
11 Sept 2025CISA remediation due date (US federal agencies) · 18 days later
27 Nov 2025CISA SSVC assessment: exploitation active · 77 days (about 3 months) later
2 Apr 2026CVE record last updated · 127 days (about 4 months) later
2 Nov 2026Analysed by vulneraibility.com · 214 days (about 7 months) later

how to fix

Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.

references

NVD CVE.org CVE Details Source

13 references in the CVE record: 13 links

Linksupport.apple.com /en-us/124925
Linksupport.apple.com /en-us/124926
Linksupport.apple.com /en-us/124927
Linksupport.apple.com /en-us/124928
Linksupport.apple.com /en-us/124929
Linksupport.apple.com /en-us/125141
Linksupport.apple.com /en-us/125142
Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-43300

Show 5 more

Linkgithub.com /cisagov/vulnrichment/issues/201
Linkgithub.com /b1n4r1b01/n-days/blob/main/CVE-2025-43300.md
Linkseclists.org /fulldisclosure/2025/Sep/52
Linkseclists.org /fulldisclosure/2025/Sep/14
Linkseclists.org /fulldisclosure/2025/Sep/10

sources

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA KEV catalog: exploitation, date added, due date
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile
PoC-in-GitHub: GitHub repositories that claim a proof of concept
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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