CVE-2025-29979 is a critical heap-based buffer overflow vulnerability in Microsoft Office Excel, impacting various Microsoft Office products including Microsoft 365 Apps and Office Online Server. This flaw carries a high CVSS score of 7.8, indicating that an attacker could achieve local code execution with high confidentiality, integrity, and availability impacts, requiring user interaction but with low attack complexity. While there are no public exploits or Metasploit modules currently available, and it is not listed in CISA's KEV catalog, the vulnerability has garnered some community discussion and media coverage, including a mention in a BleepingComputer article regarding Microsoft's May 2025 Patch Tuesday.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:* | ||
2016CPE matchmatch criteria | cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:*:* | ||
2019CPE matchmatch criteria | cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:* | ||
2021CPE matchmatch criteria | cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:*:* | ||
2021CPE matchmatch criteria | cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.