CVE-2025-21295 SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability
A use-after-free flaw in the SPNEGO Extended Negotiation mechanism allows remote attackers to execute arbitrary code on affected Windows systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-21295?
CVE-2025-21295 is a high-severity use after free vulnerability in Microsoft Windows 10 1507, published on 14 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability
Weakness: CWE-416
Which versions are affected by CVE-2025-21295?
It affects 15 products.
Products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 22h2 and 9 more.
How do I fix CVE-2025-21295?
No fix has been published for CVE-2025-21295 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-21295 being exploited?
There is no known exploitation of CVE-2025-21295 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1507
- CVE-2017-8543 Microsoft Windows Search Remote Code Execution
- CVE-2025-33053 Microsoft Windows External Control of File Name or Path
- CVE-2025-33073 Microsoft Windows SMB Client Improper Access Control
- CVE-2024-49039 Microsoft Windows Task Scheduler Privilege Escalation
- CVE-2024-43461 Microsoft Windows MSHTML Platform Spoofing
Sources
Also known as GHSA-w9m7-qmvh-fvcw.