CVE-2021-42321 is a critical Remote Code Execution (RCE) vulnerability affecting Microsoft Exchange Server. With a CVSS score of 8.8 (HIGH), it allows authenticated attackers to execute arbitrary code remotely with low attack complexity and no user interaction, leading to full compromise of confidentiality, integrity, and availability. This vulnerability is actively exploited in the wild, including by ransomware campaigns, and has publicly available exploit modules in Metasploit. The high EPSS score, FAUCET Risk Score, and extensive community discussion and media coverage highlight its significant threat and the urgent need for patching.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
2016CPE matchmatch criteria | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:* | ||
2016CPE matchmatch criteria | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:* | ||
2019CPE matchmatch criteria | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:* | ||
2019CPE matchmatch criteria | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.