SB2025040924 - Multiple vulnerabilities in Microsoft Word

Description

This security bulletin contains information about 3 vulnerabilities.

1) Acceptance of Extraneous Untrusted Data With Trusted Data (CVE-ID: CVE-2025-29816)

CWE-ID: CWE-349 - Acceptance of Extraneous Untrusted Data With Trusted Data

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

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to improper input validation in Microsoft Word. A remote attacker can bypass specific functionality of the Office Protected View.

2) Untrusted Pointer Dereference (CVE-ID: CVE-2025-27747)

CWE-ID: CWE-822 - Untrusted Pointer Dereference

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

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

The vulnerability exists due to untrusted pointer dereference in Microsoft Word. A remote attacker can trick a victim to open a specially crafted file and execute arbitrary code on the system.

3) Use-after-free (CVE-ID: CVE-2025-29820)

CWE-ID: CWE-416 - Use After Free

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

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Microsoft Word. A remote attacker can trick a victim to open a specially crafted file and execute arbitrary code on the target system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29816
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27747
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29820