DaystoPatch

AppleExploited incident

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

CVE-2025-43300Critical, CVSS 10.0In CISA's Known Exploited Vulnerabilities catalog since 21 Aug 2025

Automated timeline. Not yet checked by a researcher, so it doesn't count toward any grade.

FixedFixed for every supported version on the day it became public.

Response

Silence
same day
First public report to first vendor statementUnverified source
Exposure
same day
First public report to first fixUnverified source
Follow-through
same day
First public report to a fix for every supported versionUnverified source
  • Vendor silent
  • Vendor statement, no fix
  • Fixed for some versions
  • Fixed when disclosed
  • Date only, no time of day

Timeline and evidence

Open a moment to see its source and archived quote.

  1. First public report

    date onlyUnverified: quote not found in the archived copy

    Apple advisory 124925/CVE-2025-43300ClaimedQuote not found in archive

    iOS 18.6.2 and iPadOS 18.6.2: ImageIO. Impact: 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

    The vendor's own disclosure.

    Recorded time
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    Date only (no time of day is shown)
    Origin
    Claimed. The date the source gives.
    Quote check
    Not found in the archived copy. Treat with caution.
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    sha256:7a478e0b965683b7…
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    Yes
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    5 more sources for this moment
    Bluesky postClaimedQuote not checked yet20 Aug 2025, 18:00 UTC

    🐛 CVE-2025-43300 (ImageIO):

    Earliest third-party post we hold.

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    Bluesky post social
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    To the minute
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    Not checked yet
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    Mastodon postClaimedQuote not checked yet20 Aug 2025, 19:25 UTC

    turns into a hacker’s playground? Read on for the full scoop. https:// thedefendopsdiaries.com/apples -swift-response-to-cve-2025-43300-a-battle-against-cyber-threats/ # apple # zeroday # cybersecurity # cve202543300 # securityupdate

    Earliest third-party post we hold.

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    Mastodon post social
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    CISA KEV (CVE-2025-43300)ClaimedQuote verified21 Aug 2025

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

    Added to CISA's KEV catalog on 2025-08-21.

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    sha256:ef8fffede5c47200…
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    CVE.org record CVE-2025-43300ClaimedQuote verified21 Aug 2025, 00:27 UTC

    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

    CVE record published.

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    sha256:511965329d1d32fa…
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    Hacker NewsClaimedQuote not checked yet22 Aug 2025, 19:54 UTC

    https://github.com/b1n4r1b01/n-days/blob/main/CVE-2025-43300.md

    Earliest third-party post we hold. An independent author on another platform posted within 48 hours. Used for unreviewed incidents only, never graded.

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    Hacker News hn
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  2. Vendor statement

    date onlysame dayUnverified: quote not found in the archived copy

    Apple advisory 124925/CVE-2025-43300ClaimedQuote not found in archive

    iOS 18.6.2 and iPadOS 18.6.2: ImageIO. Impact: 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

    Recorded time
    Precision
    Date only (no time of day is shown)
    Origin
    Claimed. The date the source gives.
    Quote check
    Not found in the archived copy. Treat with caution.
    Snapshot
    sha256:7a478e0b965683b7…
    Used in metrics
    Yes
    Dispute this timestamp
    6 more sources for this moment
    Apple advisory 124926/CVE-2025-43300ClaimedQuote verified20 Aug 2025

    Released August 20, 2025

    From the advisory's revision history.

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    Found in the archived copy
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    sha256:fb51a9718fc99d47…
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    Apple advisory 124927/CVE-2025-43300ClaimedQuote verified20 Aug 2025

    Released August 20, 2025

    From the advisory's revision history.

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    Found in the archived copy
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    sha256:0664a66526dc6375…
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    Apple advisory 124928/CVE-2025-43300ClaimedQuote verified20 Aug 2025

    Released August 20, 2025

    From the advisory's revision history.

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    sha256:30fd3c5c1c0d39be…
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    Apple advisory 124929/CVE-2025-43300ClaimedQuote verified20 Aug 2025

    Released August 20, 2025

    From the advisory's revision history.

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    Claimed. The date the source gives.
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    Found in the archived copy
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    sha256:d064a2fd7220561f…
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    Apple advisory 125141/CVE-2025-43300ClaimedQuote verified15 Sep 2025

    Released September 15, 2025

    From the advisory's revision history.

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    sha256:c48f1b1a44cd66c8…
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    Apple advisory 125142/CVE-2025-43300ClaimedQuote verified15 Sep 2025

    Released September 15, 2025

    From the advisory's revision history.

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  3. First workaround

    No official mitigation found yet.

  4. First fix

    date onlysame day

    Apple advisory 124925/CVE-2025-43300ClaimedQuote verified

    Released August 20, 2025

    fixed in iOS 18.6.2 and iPadOS 18.6.2; one candidate per OS branch

    Recorded time
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    Date only (no time of day is shown)
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    Claimed. The date the source gives.
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    Found in the archived copy
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    sha256:7a478e0b965683b7…
    Used in metrics
    Yes
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    6 more sources for this moment
    Apple advisory 124926/CVE-2025-43300ClaimedQuote verified20 Aug 2025

    Released August 20, 2025

    fixed in iPadOS 17.7.10; one candidate per OS branch

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    Claimed. The date the source gives.
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    Apple advisory 124927/CVE-2025-43300ClaimedQuote verified20 Aug 2025

    Released August 20, 2025

    fixed in macOS Sequoia 15.6.1; one candidate per OS branch

    Recorded time
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    Claimed. The date the source gives.
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    Found in the archived copy
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    sha256:0664a66526dc6375…
    Used in metrics
    No, kept for the record
    Dispute this timestamp
    Apple advisory 124928/CVE-2025-43300ClaimedQuote verified20 Aug 2025

    Released August 20, 2025

    fixed in macOS Sonoma 14.7.8; one candidate per OS branch

    Recorded time
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    Claimed. The date the source gives.
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    Found in the archived copy
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    sha256:30fd3c5c1c0d39be…
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    Apple advisory 124929/CVE-2025-43300ClaimedQuote verified20 Aug 2025

    Released August 20, 2025

    fixed in macOS Ventura 13.7.8; one candidate per OS branch

    Recorded time
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    Claimed. The date the source gives.
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    Found in the archived copy
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    sha256:d064a2fd7220561f…
    Used in metrics
    No, kept for the record
    Dispute this timestamp
    Apple advisory 125141/CVE-2025-43300ClaimedQuote verified15 Sep 2025

    Released September 15, 2025

    fixed in iOS 16.7.12 and iPadOS 16.7.12; one candidate per OS branch

    Recorded time
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    Date only (no time of day is shown)
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    Claimed. The date the source gives.
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    Found in the archived copy
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    sha256:c48f1b1a44cd66c8…
    Used in metrics
    No, kept for the record
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    Apple advisory 125142/CVE-2025-43300ClaimedQuote verified15 Sep 2025

    Released September 15, 2025

    fixed in iOS 15.8.5 and iPadOS 15.8.5; one candidate per OS branch

    Recorded time
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    Date only (no time of day is shown)
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    Claimed. The date the source gives.
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    Found in the archived copy
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    sha256:ea54a6ad5c44f3c7…
    Used in metrics
    No, kept for the record
    Dispute this timestamp

  5. Fixed for all versions

    date onlysame dayUnverified: derived by rule, not read from a source

    Apple advisory 124925/CVE-2025-43300Inferred

    iOS 18.6.2 and iPadOS 18.6.2: ImageIO. Impact: 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

    Patch-day rule: Apple ships fixes in the advisory that discloses a bug, and this advisory states that fixed versions exist. So the vendor statement, first fix and fix for all versions all take the advisory's publication time.

    Recorded time
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    Date only (no time of day is shown)
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    Inferred. Derived by a documented rule.
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    Not found in the archived copy. Treat with caution.
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    sha256:7a478e0b965683b7…
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    Yes
    Dispute this timestamp

Send this to your boss

No brief for this incident yet. We write one for every open incident and every critical bug exploited before a fix.

Affected products

  • iOS, iPadOS, and macOS
  • iOS 16.7.12 and iPadOS 16.7.12
  • iOS 15.8.5 and iPadOS 15.8.5
  • 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

Related

Apple report card