SB2025040964 - Multiple vulnerabilities in Microsoft Excel

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Type Confusion (CVE-ID: CVE-2025-29791)

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

The vulnerability exists due to a type confusion error in Microsoft Excel. 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.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Use-after-free (CVE-ID: CVE-2025-27751)

The vulnerability allows a remote attacker to compromise vulnerable system.

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

3) Heap-based buffer overflow (CVE-ID: CVE-2025-27752)

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

The vulnerability exists due to a boundary error in Microsoft Excel. A remote attacker can trick a victim to open a specially crafted file, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

4) Use-after-free (CVE-ID: CVE-2025-29823)

The vulnerability allows a remote attacker to compromise vulnerable system.

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

5) Use-after-free (CVE-ID: CVE-2025-27750)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Microsoft Excel. 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-2025-29791
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27751
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27752
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29823
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27750