Denial of service in Microsoft IP Helper

1) Resource exhaustion

EUVDB-ID: #VU102783

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-21231

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources in IP Helper. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: before 10 21H2 10.0.19044.5371, 10 22H2 10.0.19045.5371, 10 1507 10.0.10240.20890, 10 1607 10.0.14393.7699, 10 1809 10.0.17763.6775, 11 22H2 10.0.22621.4751, 11 23H2 10.0.22631.4751, 11 24H2 10.0.26100.2894, 10 21H2 10.0.19044.5371, 10 21H2 10.0.19044.5371, 10 21H2 10.0.19044.5371, 10 21H2 10.0.19044.5371, 10 21H2 10.0.19044.5371, 10 21H2 10.0.19044.5371, 10 21H2 10.0.19044.5371

Windows Server: before 2008 R2 6.1.7601.27520, 2008 6.0.6003.23070, 2012 R2 6.3.9600.22371, 2012 6.2.9200.25273, 2016 10.0.14393.7699, 2022 10.0.20348.3091, 2022 23H2 10.0.25398.1369, 2025 10.0.26100.2894, 2008 R2 6.1.7601.27520, 2008 R2 6.1.7601.27520, 2008 R2 6.1.7601.27520, 2008 R2 6.1.7601.27520

CPE2.3

• cpe:2.3:o:microsoft:windows:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:*:*:*:*:*:*:*:*

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21231

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.