CVE-2021-27646 json
Use After Free vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers…
published 2021-03-12 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14392
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.9%
- EPSS 3.9% chance of exploitation in 30 days, percentile 90%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Synology Synology DiskStation Manager (DSM) 6.2.3-25426-3
Exploit prediction
3.92% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Synology Synology DiskStation Manager (DSM)
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
synology.com
/security/advisory/Synology_SA_20_26
vendor-advisory
-
zerodayinitiative.com
/advisories/ZDI-21-340/
third-party-advisory, vdb-entry
-
zerodayinitiative.com
/advisories/ZDI-21-339/
not-applicable
Sources
- CVE List CVE-2021-27646
- NVD CVE-2021-27646
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.