CVE-2021-26566: synology diskstation_manager
CVSS: 9.0v3.1CriticalModified
Published 26-02-2021Last modified 17-09-2024
Vulnerability summary
CVE-2021-26566 is a critical (CVSS 9.0) vulnerability in synology diskstation_manager. EPSS estimates a 1.51% chance of exploitation in the next 30 days, higher than 73.9% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.0/10
010
Critical · v3.1 (NVD)EPSS score
1.51%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 26-02-2021PublishedVulnerability first disclosed.
- 17-09-2024Last modifiedVulnerability information updated.
Description
Insertion of sensitive information into sent data vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary commands via inbound QuickConnect traffic.
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.0Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:HSources2 sources · 8.3–9.0
- CVE.orgCNA8.3HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:HDiffers
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.51%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
0.00 pp
From 1.51% on 18-09-2026
18-09-202618-10-2026
EPSS score1.51%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (talosintelligence.com)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-201Insertion of Sensitive Information Into Sent DataThe code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.
- CWE-200Exposure of Sensitive Information to an Unauthorized ActorThe product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
Affected systems
Synology5 products
- diskstation_manager< 6.2.3-25426-3
- diskstation_manager_unified_controller3.0
- skynasna
- synology diskstation manager (dsm)≥ unspecified, < 6.2.3-25426-3
- vs960hd_firmwarena
1 vendor · 5 products
References
2 links- www.talosintelligence.com/vulnerability_reports/TALOS-2020-1160X Refsource MISCExploitThird Party Advisory