Remote code execution in Microsoft Internet Explorer

1) Type Confusion

EUVDB-ID: #VU102763

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-21326

CWE-ID: CWE-843 - Type confusion

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error in Internet Explorer. A remote attacker can trick a victim to open a specially crafted file, trigger a type confusion error and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows Server: 2016 10.0.14393.10 - 2025 10.0.26100.2605

CPE2.3

• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.10:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.51:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.82:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.105:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.187:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.222:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.321:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.351:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.447:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.479:*:*:*:*:*:*

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21326

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.