CVE-2021-27646
9.8
CRITICAL · CVSS 3.1 · EPSS 3.9% (pctl 90)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
Use After Free vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute arbitrary code via crafted web requests.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 3.92% — more likely to be exploited than 90% of all CVEs |
| Weakness | CWE-416 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-03-12 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| synology | diskstation manager |
References
- https://www.synology.com/security/advisory/Synology_SA_20_26
- https://www.zerodayinitiative.com/advisories/ZDI-21-339/
- https://www.zerodayinitiative.com/advisories/ZDI-21-340/
- https://www.synology.com/security/advisory/Synology_SA_20_26
- https://www.zerodayinitiative.com/advisories/ZDI-21-339/
- https://www.zerodayinitiative.com/advisories/ZDI-21-340/
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