April 2025 security updates: Microsoft Patch Tuesday, macOS and Linux
Microsoft's Patch Tuesday on April 8, 2025 fixed 115 CVEs (10 critical, 1 exploited at release) in 34 security updates. Apple released 1 macOS update fixing 2 CVEs. Debian, Ubuntu, Red Hat and Fedora released 2,078 Linux fixes for 546 CVEs. Every April 2025 security update, ranked by whether its vulnerabilities are being exploited.
Which of your machines are still exposed? Get a demo.
Updates by month
What Microsoft, Apple and the Linux distributions released in a calendar month. Each list is in priority order: exploited (KEV or vendor-confirmed) first, then by exploited CVEs closed, then by highest EPSS. Counts include every update released that month, supported products or not. Third-party apps follow below, by recent vulnerability.
Microsoft
All Microsoft fixes for April 2025Patch Tuesday was April 8, 2025: 115 CVEs (10 critical) in 34 security updates, 1 exploited at release.
Show as a table
| Product family | CVEs | Patch now | Urgent | High | Routine | Exploited | Most urgent fix |
|---|---|---|---|---|---|---|---|
| Windows Server | 89 | 1 | 10 | 59 | 19 | 1 | KB5055523 |
| Windows 11 | 68 | 1 | 7 | 47 | 13 | 1 | KB5055523 |
| Windows 10 | 65 | 1 | 7 | 45 | 12 | 1 | KB5055519 |
| Microsoft Office | 15 | 0 | 6 | 9 | 0 | 0 | KB5002623 |
| SharePoint Server | 6 | 0 | 2 | 4 | 0 | 0 | KB5002691 |
| Azure | 1 | 0 | 0 | 1 | 0 | 0 | KB5055526 |
| Dynamics 365 | 1 | 0 | 0 | 0 | 1 | 0 | KB5056716 |
| Priority | Update | Type | Released | CVEs | Exploited | Max EPSS | Max CVSS |
|---|---|---|---|---|---|---|---|
| Patch now | KB5055523 Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows Server 2025 and 1 more |
Security | Apr 8, 2025 | 84 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055526 Azure Stack HCI OS 22H2, Windows Server 2022, Windows Server 2022 (Server Core installation) |
ServicingStack | Apr 8, 2025 | 78 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055519 Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 1 more |
Security | Apr 8, 2025 | 75 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055527 Windows Server 2022, 23H2 Edition (Server Core installation) |
ServicingStack | Apr 8, 2025 | 75 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055528 Windows 11 Version 22H2 for ARM64-based Systems, Windows 11 Version 22H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems and 1 more |
Security | Apr 8, 2025 | 67 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055518 Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems and 5 more |
Security | Apr 8, 2025 | 61 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055521 Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016 and 1 more |
Security | Apr 8, 2025 | 61 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055557 Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) |
Security | Apr 8, 2025 | 54 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055581 Windows Server 2012, Windows Server 2012 (Server Core installation) |
Security | Apr 8, 2025 | 47 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055547 Windows 10 for 32-bit Systems, Windows 10 for x64-based Systems |
Security | Apr 9, 2025 | 44 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055561 Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |
Security | Apr 8, 2025 | 42 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055570 Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |
Security | Apr 8, 2025 | 42 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055596 Windows Server 2008 for 32-bit Systems Service Pack 2, Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation), Windows Server 2008 for x64-based Systems Service Pack 2 and 1 more |
Security | Apr 8, 2025 | 39 | KEVRansomware1 | 0.1925 | 8.8 |
| Patch now | KB5055609 Windows Server 2008 for 32-bit Systems Service Pack 2, Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation), Windows Server 2008 for x64-based Systems Service Pack 2 and 1 more |
Security | Apr 8, 2025 | 39 | KEVRansomware1 | 0.1925 | 8.8 |
| Urgent | KB5002691 Microsoft SharePoint Server 2019 |
Security | Apr 8, 2025 | 4 | None | 0.2363 | 8.8 |
| Urgent | KB5002692 Microsoft SharePoint Enterprise Server 2016 |
Security | Apr 8, 2025 | 4 | None | 0.2363 | 8.8 |
| Urgent | KB5002705 Microsoft SharePoint Server Subscription Edition |
Security | Apr 8, 2025 | 2 | None | 0.2363 | 8.8 |
| Urgent | KB5002623 Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) |
Security | Apr 8, 2025 | 7 | None | 0.0116 | 7.8 |
| Urgent | KB5002700 Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) |
Security | Apr 8, 2025 | 7 | None | 0.0116 | 7.8 |
| High | KB5002699 Office Online Server |
Security | Apr 8, 2025 | 3 | None | 0.0253 | 7.8 |
| High | KB5002704 Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition) |
Security | Apr 8, 2025 | 3 | None | 0.0253 | 7.8 |
| High | KB5056456 Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) |
Security | Apr 11, 2025 | 1 | None | 0.0218 | 7.5 |
| High | KB5002669 Microsoft Office 2016 (64-bit edition) |
Security | Apr 8, 2025 | 1 | None | 0.0122 | 7.8 |
| High | KB5002680 Microsoft SharePoint Server 2019, SharePoint Server Subscription Edition Language Pack |
Security | Apr 8, 2025 | 2 | None | 0.0088 | 7.8 |
| High | KB4484432 Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) |
Security | Apr 8, 2025 | 1 | None | 0.0088 | 7.8 |
| High | KB5002702 Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Word 2016 (32-bit edition) and 1 more |
Security | Apr 8, 2025 | 3 | None | 0.0084 | 7.8 |
| High | KB5002682 Microsoft SharePoint Enterprise Server 2016 |
Security | Apr 8, 2025 | 2 | None | 0.0084 | 7.8 |
| High | KB5002622 Microsoft OneNote 2016 (32-bit edition), Microsoft OneNote 2016 (64-bit edition) |
Security | Apr 8, 2025 | 1 | None | 0.0084 | 7.8 |
| High | KB5002588 Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) |
Security | Apr 8, 2025 | 1 | None | 0.0081 | 7.8 |
| High | KB5002701 Microsoft Access 2016 (32-bit edition), Microsoft Access 2016 (64-bit edition) |
Security | Apr 8, 2025 | 1 | None | 0.0081 | 7.8 |
| High | KB5002703 Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) |
Security | Apr 8, 2025 | 1 | None | 0.0081 | 7.8 |
| High | KB5055515 Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Windows Server 2008 for 32-bit Systems Service Pack 2 and 7 more |
Security | Apr 8, 2025 | 1 | None | 0.0078 | 8.6 |
| High | KB5002573 Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) |
Security | Apr 8, 2025 | 1 | None | 0.0048 | 7.5 |
| Routine | KB5056716 Microsoft Dynamics 365 Business Central 2023 Wave 2 – Update 23.18 |
Security | Apr 8, 2025 | 1 | None | 0.0071 | 5.5 |
| Routine | KB5056717 Microsoft Dynamics 365 Business Central Wave 1 2024 – Update 24.12 |
Security | Apr 8, 2025 | 1 | None | 0.0071 | 5.5 |
| Routine | KB5056718 Microsoft Dynamics 365 Business Central 2024 Wave 2 – Update 25.6 |
Security | Apr 8, 2025 | 1 | None | 0.0071 | 5.5 |
macOS
| Priority | Apple update | Released | CVEs | Exploited | Max EPSS | Max CVSS |
|---|---|---|---|---|---|---|
| Patch now | Sequoia 15.4.1 Sequoia |
Apr 16, 2025 | 2 | KEV2 | 0.2090 | 9.8 |
| Distribution | Fixes | CVEs fixed | Closing exploited CVEs | Patch now |
|---|---|---|---|---|
| Ubuntu | 1,515 | 78 | 234 | 234 |
| Debian | 495 | 465 | 4 | 4 |
| Red Hat | 68 | 96 | 5 | 5 |
Highest priority this month
| Priority | Fix | Released | CVEs | Exploited | Max EPSS | Max CVSS |
|---|---|---|---|---|---|---|
| Patch now | RHSA-2025:3683 tomcat, tomcat-admin-webapps, tomcat-docs-webapp and 5 more on RHEL 8 |
Apr 8, 2025 | 2 | KEV1 | 0.9994 | 9.8 |
| Patch now | RHSA-2025:3645 tomcat, tomcat-admin-webapps, tomcat-docs-webapp and 5 more on RHEL 9 |
Apr 7, 2025 | 2 | KEV1 | 0.9994 | 9.8 |
| Patch now | DSA-5893-1 tomcat10 on Debian 12.15 (bookworm) |
Apr 5, 2025 | 1 | KEV1 | 0.9994 | 9.8 |
| Patch now | DLA-4108-1 tomcat9 on Debian 11.6 (bullseye) |
Apr 1, 2025 | 1 | KEV1 | 0.9994 | 9.8 |
| Patch now | DEBIAN-CVE-2025-32433 erlang on Debian 12.15 (bookworm), Debian 13.5 (trixie), Debian 14 |
Apr 16, 2025 | 1 | KEV1 | 0.9892 | 10.0 |
| Patch now | erlang 1:25.3.2.12+dfsg-1ubuntu2.3 erlang on Ubuntu 24.10 (oracular) |
Apr 16, 2025 | 1 | KEV1 | 0.9892 | 10.0 |
| Patch now | erlang 1:27.3+dfsg-1ubuntu1.1 erlang on Ubuntu 25.04 (plucky) |
Apr 16, 2025 | 1 | KEV1 | 0.9892 | 10.0 |
| Patch now | erlang-asn1 1:25.3.2.12+dfsg-1ubuntu2.3 erlang-asn1 on Ubuntu 24.10 (oracular) |
Apr 16, 2025 | 1 | KEV1 | 0.9892 | 10.0 |
| Patch now | erlang-asn1 1:27.3+dfsg-1ubuntu1.1 erlang-asn1 on Ubuntu 25.04 (plucky) |
Apr 16, 2025 | 1 | KEV1 | 0.9892 | 10.0 |
| Patch now | erlang-base 1:25.3.2.12+dfsg-1ubuntu2.3 erlang-base on Ubuntu 24.10 (oracular) |
Apr 16, 2025 | 1 | KEV1 | 0.9892 | 10.0 |
Patch Tuesday, month by month
CVEs Microsoft released on each Patch Tuesday, counted by original release date and excluding Azure Linux, the same way the industry trackers count. Select a bar to see that month above.
Show as a table
| Month | CVEs | Critical | Security updates | Exploited at release | Write-up |
|---|---|---|---|---|---|
| Oct 2026 | 1,420 | 80 | 51 | 1 | Read |
| Sep 2026 | 1,004 | 113 | 57 | 2 | Read |
| Aug 2026 | 710 | 84 | 58 | 1 | Read |
| Jul 2026 | 574 | 57 | 56 | 3 | Read |
| Jun 2026 | 246 | 30 | 28 | 0 | Read |
| May 2026 | 114 | 15 | 40 | 0 | Read |
| Apr 2026 | 176 | 7 | 50 | 2 | Read |
| Mar 2026 | 78 | 3 | 39 | 0 | Read |
| Feb 2026 | 53 | 2 | 29 | 6 | Read |
| Jan 2026 | 116 | 8 | 26 | 1 | Read |
| Dec 2025 | 72 | 0 | 29 | 1 | Read |
| Nov 2025 | 64 | 4 | 31 | 1 | None |
Third-party apps
Apps with vulnerabilities published, or added to CISA's Known Exploited Vulnerabilities catalog, in the last 90 days. Most urgent first. Updating to the latest version covers every vulnerability counted here.
Windows apps
All Windows app fixesThe 50 most urgent of 488 apps.
macOS apps
13 apps.
| Priority | App | Latest version | CVEs | Exploited | Max EPSS | Max CVSS | Most urgent fix |
|---|---|---|---|---|---|---|---|
| Patch now | Microsoft Edge Microsoft |
157.0.4341.42 | 1,239 | KEV3 | 0.0981 | 9.8 | Microsoft Edge 154.0.4258.62 |
| Patch now | Google Chrome Google |
157.0.8103.39 | 1,442 | KEV2 | 0.0351 | 9.8 | Google Chrome 153.0.8010.37 |
| Urgent | Microsoft Visual Studio Code Microsoft |
1.145.1 | 30 | None | 0.0106 | 9.6 | Microsoft Visual Studio Code 1.133.0 |
| Urgent | Mozilla Thunderbird Mozilla |
159.0 | 236 | None | 0.0072 | 10.0 | Mozilla Thunderbird 154.0 |
| Urgent | Mozilla Firefox Mozilla |
159.0.1 | 230 | None | 0.0072 | 10.0 | Mozilla Firefox 153.5.0 |
| Urgent | PyCharm JetBrains |
2026.3 | 4 | None | 0.0029 | 9.0 | PyCharm 2026.2.4 |
| Urgent | WebStorm JetBrains |
2026.3 | 2 | None | 0.0029 | 9.0 | WebStorm 2026.2.4 |
| High | Docker Desktop Docker |
4.98.0 | 2 | None | 0.0044 | 7.8 | Docker Desktop 4.86.0 |
| High | VLC media player VideoLAN |
3.0.24 | 2 | None | 0.0024 | 7.3 | VLC media player 3.0.24 |
| High | Parallels Desktop Parallels |
27.1.0 | 1 | None | 0.0017 | 7.8 | Parallels Desktop 26.4.1 |
| Routine | Microsoft Defender Microsoft |
101.26092.0012 | 1 | None | 0.0048 | 5.5 | Microsoft Defender 101.26042.0020 |
| Routine | OneDrive Microsoft |
26.189.0928 | 1 | None | 0.0039 | 6.7 | OneDrive 26.098.0524 |
| Routine | KeePassXC KeePassXC |
2.8.0 | 2 | None | 0.0014 | 4.3 | KeePassXC 2.8.0 |
All fixes
One row per thing you install: a Microsoft KB, an app version, a macOS update or a Linux advisory. Sorted by priority, then by exploited CVEs closed, then by highest EPSS.
| Priority | Fix | Platform | Released | CVEs | Exploited | Max EPSS | Max CVSS |
|---|---|---|---|---|---|---|---|
| Patch now | Google Chrome 156.0.8078.80
Google Chrome |
Windows apps | Oct 29, 2026 | 204 | KEV4 | 0.5496 | 9.8 |
| Patch now | Google Chrome Beta 158.0.8127.2
Google Chrome Beta |
Windows apps | Oct 28, 2026 | 201 | KEV4 | 0.5496 | 9.8 |
| Patch now | Google Chrome Dev 159.0.8130.0
Google Chrome Dev |
Windows apps | Oct 30, 2026 | 174 | KEV3 | 0.1374 | 9.8 |
| Patch now | RHSA-2026:87080
apcu-panel, libzip, libzip-devel and 34 more on RHEL 8 |
Linux | Oct 24, 2026 | 12 | KEV2 | 1.0000 | 9.8 |
| Patch now | RHSA-2026:87071
php8.4 on RHEL 10 |
Linux | Oct 24, 2026 | 3 | KEV2 | 1.0000 | 9.8 |
| Patch now | RHSA-2026:87079
apcu-panel, php-pecl-apcu, php-pecl-apcu-devel and 4 more on RHEL 9 |
Linux | Oct 24, 2026 | 3 | KEV2 | 1.0000 | 9.8 |
| Patch now | RHSA-2026:87151
php, php-bcmath, php-cli and 22 more on RHEL 9 |
Linux | Oct 24, 2026 | 3 | KEV2 | 1.0000 | 9.8 |
| Patch now | RHSA-2026:87073
php-pecl-xdebug3 on RHEL 8 |
Linux | Oct 24, 2026 | 3 | KEV2 | 1.0000 | 9.8 |
| Patch now | RHSA-2026:88561
php on RHEL 10 |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | libapache2-mod-php8.3 8.3.6-0ubuntu0.24.04.13
libapache2-mod-php8.3 on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | libphp8.3-embed 8.3.6-0ubuntu0.24.04.13
libphp8.3-embed on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3 8.3.6-0ubuntu0.24.04.13
php8.3 on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-bcmath 8.3.6-0ubuntu0.24.04.13
php8.3-bcmath on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-bz2 8.3.6-0ubuntu0.24.04.13
php8.3-bz2 on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-cgi 8.3.6-0ubuntu0.24.04.13
php8.3-cgi on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-cli 8.3.6-0ubuntu0.24.04.13
php8.3-cli on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-common 8.3.6-0ubuntu0.24.04.13
php8.3-common on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-curl 8.3.6-0ubuntu0.24.04.13
php8.3-curl on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-dba 8.3.6-0ubuntu0.24.04.13
php8.3-dba on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-enchant 8.3.6-0ubuntu0.24.04.13
php8.3-enchant on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-fpm 8.3.6-0ubuntu0.24.04.13
php8.3-fpm on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-gd 8.3.6-0ubuntu0.24.04.13
php8.3-gd on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-gmp 8.3.6-0ubuntu0.24.04.13
php8.3-gmp on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-imap 8.3.6-0ubuntu0.24.04.13
php8.3-imap on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
| Patch now | php8.3-interbase 8.3.6-0ubuntu0.24.04.13
php8.3-interbase on Ubuntu 24.04.5 LTS (noble) |
Linux | Oct 24, 2026 | 2 | KEV2 | 1.0000 | 9.8 |
How priority is set
Four tiers with published rules, the same rules the Patchblox Vulnerability Hub uses. A fix takes the highest tier of any CVE it closes.
Exploited in the wild: the vendor reports exploitation, or the CVE is in CISA's Known Exploited Vulnerabilities catalog.
The vendor rates exploitation as more likely, or rates the CVE Critical.
CVSS 7.0 or higher, or rated High by the vendor when no CVSS score is published.
Everything else. Still worth installing on your normal schedule.
EPSS is shown as context and breaks ties within a tier. It does not move a CVE between tiers: a probability model should not outrank a confirmed exploitation report.
Where the data comes from
This list is everyone's. Yours is shorter.
The tracker tells you what's exploited and what fixes it. Patchblox tells you which of your machines are still exposed, on every platform, and deploys the fix on Windows and Linux.
- Works from the Intune, Entra and Azure Update Manager data you already have
- Matches every installed app and OS build to the fix that closes its CVEs
- Deploys through rings with validation, then confirms the exposure closed