Exploit discussion active in current signal (1 latest mentions)
Recommended action window: High priority (within 72h)
NVD description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
| Date | Total | Labels |
|---|
| 2026-02-10 | 2 | Disclosure1Patch1 |
| 2026-02-11 | 1 | Disclosure1 |
| 2026-02-19 | 1 | Disclosure1 |
| 2026-02-20 | 1 | Disclosure1 |
| 2026-02-22 | 1 | Disclosure1 |
| 2026-02-24 | 1 | PoC1 |
| 2026-02-25 | 1 | General1 |
| 2026-03-16 | 1 | Patch1 |
| 2026-06-15 | 1 | Disclosure1 |
| 2026-09-13 | 1 | PoC1 |
Launched my blog with a quick exploit for CVE-2026-21241. Huge thanks to @Dark_Puzzle for finding the bug and @Bad_Jubies for diffing the patch. https://jle-k.com/blog/Exploiting+CVE-2026-21241 https://t.co/ySKTWwMOlT
Post summary
The author launched a blog featuring a quick exploit for CVE-2026-21241, acknowledging contributors and referencing a patch.
I made a write up diffing and triggering a use after free vulnerability in AFD.sys that was fixed in this month’s patch Tuesday: https://bad-jubies.github.io/cve-2026-21241-ancillary-function-driver
Post summary
A write‑up details a use‑after‑free bug in AFD.sys (CVE‑2026‑21241) and provides a PoC link, noting the issue was fixed in March’s patch Tuesday.
I've published the first entry in my new Windows vulnerability research series. It details how exploring Windows I/O completion internals led to uncovering a use-after-free in afd.sys (CVE-2026-21241). https://rce4fun.blogspot.com/2026/02/use-after-free-in-afdsys-cve-2026-21241.html
Post summary
The author announces the discovery of a use‑after‑free flaw in afd.sys (CVE‑2026‑21241) and shares a blog post detailing the findings, but does not provide proof of exploitation or remediation steps.
This month's Patch Tuesday fixes CVE-2026-21241, a use-after-free I reported in the Ancillary Function Driver for WinSock (afd.sys). I am planning a blog series covering my recent findings in the Windows kernel, to be released after coordination with @msftsecresponse. https://t.co/wFb61C9ANX
Post summary
Patch Tuesday fixed CVE-2026-21241, a use‑after‑free in Windows’ afd.sys; the author plans a blog series after coordinating with Microsoft.
[1day-1line] CVE-2026-21241: Use-After-Free LPE Vulnerability Caused by I/O Mini-Completion Packet Lifetime Management Error in Windows afd.sys Hello, this is Libera. Today's 1day-1line is about a Use-After-Free Privilege Escalation (LPE) vulnerability occurring in afd.sys, a WinSock kernel driver for Windows. This vulnerability occurs during the socket state notification process; while AfdNotifyPostEvents briefly releases the spinlock, socket cleanup (AfdNotifyDestroyContext) releases mini-completion packets without cancellation, causing the remaining released packets in the queue to be dequeued. Please refer to the blog post for more details! https://hackyboiz.github.io/2026/06/15/Libera/CVE-2026-21241/
Post summary
The announcement outlines a use‑after‑free privilege escalation flaw in Windows afd.sys, detailing its cause while offering no proof‑of‑concept, exploit code, mitigation, or evidence of active exploitation.
Top 5 Trending CVEs: 1 - CVE-2026-20700 2 - CVE-2025-1234 3 - CVE-2026-21513 4 - CVE-2026-21241 5 - CVE-2025-5959 #cve #cvetrends #cveshield #cybersecurity https://www.cveshield.com/dashboard
Post summary
The post lists five trending CVEs without providing additional details or context.
@Bad_Jubies how do you manage to get old version of windows image to test the poc here https://bad-jubies.github.io/cve-2026-21241-ancillary-function-driver
Post summary
The tweet seeks instructions for acquiring an older Windows image to test a proof-of-concept for CVE-2026-21241 and links to a repository that likely contains the PoC details.
#windowsupdate #microsoft (つづき) ・CVE-2026-21238 7.8 Windows Ancillary Function Driver for WinSock ・CVE-2026-21241 7 Windows Ancillary Function Driver for WinSock ・CVE-2026-21253 7 メールスロット ファイル システム ・CVE-2026-21511 7.5 Microsoft Office Outlook
Post summary
The tweet lists newly disclosed Windows CVEs with severity scores, without providing PoC, exploitation details, or patch information.
CVE-2026-21241 Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally. https://www.cve.org/CVERecord?id=CVE-2026-21241
Post summary
CVE-2026-21241 is a use-after-free flaw in the Windows Ancillary Function Driver for WinSock that permits an authorized local attacker to elevate privileges. The post provides technical details but no PoC, exploit code, patch, or evidence of active exploitation.
Use after free dans le driver WinSock : un attaquant local passe admin sans bruit. Élévation de privilèges locale, exploitation post-compromission. Le vrai risque : chaîner cette faille avec un accès initial banal. Patcher maintenant, pas demain. #CVE https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21241
Post summary
The post alerts readers to a use‑after‑free bug in the WinSock driver that can allow local privilege escalation, emphasizing the need to apply the vendor’s patch immediately.
ثغرة Use-After-Free في ملف نواة ويندوز afd.sys تم توثيقها تحت المعرّف CVE-2026-21241. هذا النوع من الثغرات يُعد عالي الخطورة لأنه قد يؤدي إلى تنفيذ تعليمات برمجية بصلاحيات النظام (Kernel-Level Privileges)، مما يفتح الباب أمام تصعيد الصلاحيات والسيطرة الكاملة على النظام في حال تم استغلاله بنجاح. هذا النوع من الثغرات يبرز أهمية تحديث الأنظمة باستمرار ومتابعة مكونات النواة منخفضة المستوى التي غالبًا ما تكون هدفًا رئيسيًا للمهاجمين. A Use-After-Free vulnerability in the Windows kernel component afd.sys, tracked as CVE-2026-21241, could allow attackers to achieve kernel-level code execution and privilege escalation if successfully exploited. This class of vulnerabilities highlights why keeping operating systems patched and closely monitoring low-level kernel components is critical for maintaining a strong security posture. Source: https://rce4fun.blogspot.com/2026/02/use-after-free-in-afdsys-cve-2026-21241.html #CyberSecurity #WindowsSecurity #KernelSecurity #Vulnerability #InfoSec #Exploit #CVE
Post summary
The post announces a high‑severity use‑after‑free flaw in Windows afd.sys (CVE‑2026‑21241) that could enable kernel‑level code execution and privilege escalation, emphasizing the need for timely patching.
9 of 9 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| OS | microsoft | windows_11_23h2 | - | - | arm64 |
| OS | microsoft | windows_11_23h2 | - | - | x64 |
| OS | microsoft | windows_11_24h2 | - | - | arm64 |
| OS | microsoft | windows_11_24h2 | - | - | x64 |
| OS | microsoft | windows_11_25h2 | - | - | arm64 |
| OS | microsoft | windows_11_25h2 | - | - | x64 |
| OS | microsoft | windows_server_2022 | - | - | - |
| OS | microsoft | windows_server_2022_23h2 | - | - | - |
| OS | microsoft | windows_server_2025 | - | - | - |