CVE-2021-43256 is a Remote Code Execution vulnerability affecting Microsoft Excel and other Microsoft 365 applications, allowing an attacker to execute arbitrary code. It carries a CVSS score of 7.8 (High), indicating a significant risk where user interaction is required for exploitation, but successful attacks could lead to full compromise of confidentiality, integrity, and availability. While no public exploit code is available (Metasploit, Nuclei, ExploitDB), it has garnered some community discussion and media coverage, though it is not currently listed on CISA's KEV catalog as actively exploited.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:* | ||
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:* | ||
2013CPE matchmatch criteria | cpe:2.3:a:microsoft:excel:2013:sp1:*:*:*:*:x64:* | ||
2013CPE matchmatch criteria | cpe:2.3:a:microsoft:excel:2013:sp1:*:*:*:*:x86:* | ||
2016CPE matchmatch criteria | cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:* |
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.