CVE-2021-34809 json
Improper neutralization of special elements used in a command ('Command Injection') vulnerability in task management component in Synology…
published 2021-06-18 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21456
- cvss
- 9.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.9%
- EPSS 1.9% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known
Summary
Improper neutralization of special elements used in a command ('Command Injection') vulnerability in task management component in Synology Download Station before 3.8.16-3566 allows remote authenticated users to execute arbitrary code via unspecified vectors.
Patch / fix
- Synology Download Station 3.8.16-3566
Exploit prediction
1.93% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
Affected products
- Synology Download Station
Classification
- Weakness
-
- CWE-77 Improper Neutralization of Special Elements used in a Command
References
-
synology.com
/security/advisory/Synology_SA_21_11
vendor-advisory
Sources
- CVE List CVE-2021-34809
- NVD CVE-2021-34809
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