SB20250114114 - Multiple vulnerabilities in Microsoft Windows Kerberos

Description

This security bulletin contains information about 3 vulnerabilities.

1) Resource exhaustion (CVE-ID: CVE-2025-21218)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

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 Windows Kerberos. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

2) Information disclosure (CVE-ID: CVE-2025-21242)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in Windows Kerberos. A remote attacker can gain unauthorized access to sensitive information on the system.

3) Insecure Storage of Sensitive Information (CVE-ID: CVE-2025-21299)

CWE-ID: CWE-922 - Insecure Storage of Sensitive Information

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to bypass security features.

The vulnerability exists due to insecure storage of sensitive information in Windows Kerberos. A local user can bypass Windows Defender Credential Guard Feature to leak Kerberos Credential.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21218
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21242
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21299