PT-2025-20979 · Microsoft · Office Excel

0X140Ce · Published 2025-05-13 · Updated 2025-08-04 · CVE-2025-29977

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Microsoft Office Excel (affected versions not specified)

Description: The issue is related to a use-after-free flaw in Microsoft Office Excel, allowing an unauthorized attacker to execute code locally. This can enable remote attackers to execute arbitrary code and affect the system. The vulnerability can be exploited by opening or previewing malicious Excel files, potentially giving attackers system control.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2025-05606

CVE-2025-29977

Affected Products

Office Excel

References · 8

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29977 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/720994 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-29977 · Security Note
• https://osv.dev/vulnerability/CVE-2025-29977 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-05606 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-29977 · Security Note
• https://twitter.com/ZeroPathLabs/status/1922450116754989498 · Twitter Post
• https://twitter.com/CVEnew/status/1922339836150874413 · Twitter Post