CVE-2021-27646
CRITICALCVSS 9.8/10EPSS 3.79%
Last modified
CVE-2021-27646 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 3.79% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Synology | Diskstation Manager | < 6.2.3-25426-3 |
References
- https://www.synology.com/security/advisory/Synology_SA_20_26Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-339/Not Applicable
- https://www.zerodayinitiative.com/advisories/ZDI-21-340/Third Party Advisory, VDB Entry
- https://www.synology.com/security/advisory/Synology_SA_20_26Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-339/Not Applicable
- https://www.zerodayinitiative.com/advisories/ZDI-21-340/Third Party Advisory, VDB Entry
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27646?
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.
How severe is CVE-2021-27646?
CVE-2021-27646 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.79% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27646?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-27646?
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Scan your code nowSource: NVD / NIST