CVE-2021-26422 is a Remote Code Execution vulnerability affecting Microsoft Skype for Business and Lync servers. With a CVSS score of 7.2 (HIGH), this vulnerability allows an authenticated attacker to execute arbitrary code remotely with high impact on confidentiality, integrity, and availability, requiring no user interaction. While not listed in CISA's KEV catalog, there is no public exploit code available (Metasploit, Nuclei, ExploitDB), and community discussion and media coverage are minimal, suggesting limited current exploitation.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
2013CPE matchmatch criteria | cpe:2.3:a:microsoft:lync_server:2013:cumulative_update_10:*:*:*:*:*:* | ||
2015CPE matchmatch criteria | cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_11:*:*:*:*:*:* | ||
2019CPE matchmatch criteria | cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_5:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.3 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.