EUVD-2026-82774
GHSA-q2v9-22q3-c377
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network vector with full file read/write and DoS impact, but predicting weak-entropy login values realistically implies AC:H rather than the vendor's AC:L.
Primary rating from Vendor (synology).
CVSS VectorVendor: synology
Lifecycle Timeline
3DescriptionCVE.org
An insufficient entropy vulnerability in login logic in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote attackers to read or write arbitrary files and conduct denial-of-service attacks.
Articles & Coverage 2
AnalysisAI
Synology DiskStation Manager (DSM) login logic uses insufficiently random values, letting remote unauthenticated attackers (CVSS PR:N) read or write arbitrary files and mount denial-of-service attacks on NAS devices running DSM before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075. Synology rates the flaw 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), while independent assessment keeps the same impact but raises attack complexity to High, since the attacker must successfully predict or reproduce the weakly-random login value, potentially requiring repeated attempts or offline computation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions stated for reaching the flaw - remote unauthenticated exploitation against the login logic of default Synology DSM installations (versions before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuinely high-priority issue on paper: the vendor CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H = 9.8) describes a remote, unauthenticated flaw with full confidentiality, integrity, and availability impact - arbitrary file read/write plus denial of service. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade DSM to 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, or 7.4-90075 (whichever matches your installed 7.2.x/7.3.x/7.4 branch) as directed by Synology advisory Synology_SA_26_13 (https://www.synology.com/en-global/security/advisory/Synology_SA_26_13); DSM's Control Panel > Update & Restore performs the in-place update. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Synology DSM instances running versions before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075, and immediately restrict remote access to DSM management interfaces (e.g., disable WAN access, enforce VPN, or apply firewall rules to allow only trusted IPs). …
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Same weakness CWE-331 – Insufficient Entropy
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External POC / Exploit Code
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