CVE-2021-26566 is a critical vulnerability affecting Synology DiskStation Manager (DSM) versions before 6.2.3-25426-3, as well as other Synology products. It involves the insertion of sensitive information into sent data within the synorelayd service, allowing man-in-the-middle (MITM) attackers to execute arbitrary commands via inbound QuickConnect traffic. With a CVSS score of 9.0 (CRITICAL), this vulnerability has a network attack vector, high attack complexity, and can lead to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, public exploit code, or significant community discussion, the potential impact remains severe.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 6.2.3-25426-3CPE matchmatch criteria | cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:* | ||
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:o:synology:vs960hd_firmware:-:*:*:*:*:*:*:* | ||
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:o:synology:skynas_firmware:-:*:*:*:*:*:*:* | ||
3.0CPE matchmatch criteria | cpe:2.3:o:synology:diskstation_manager_unified_controller:3.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.4 Reddit, 1.2 Bluesky, 0.8 Mastodon, and 2.3 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.8 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.