CVE-2021-35971
CRITICALCVSS 9.8/10EPSS 1.24%
Last modified
CVE-2021-35971 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Veeam Backup and Replication 10 before 10.0.1.4854 P20210609 and 11 before 11.0.0.837 P20210507 mishandles deserialization during Microsoft .NET remoting.. EPSS estimates a 1.24% chance of exploitation in the next 30 days.
Description
Veeam Backup and Replication 10 before 10.0.1.4854 P20210609 and 11 before 11.0.0.837 P20210507 mishandles deserialization during Microsoft .NET remoting.
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 |
|---|---|---|
| Veeam | Veeam Backup \& Replication | >= 10.0, < 10.0.1.4854 |
| Veeam | Veeam Backup \& Replication | >= 11.0, < 11.0.0.837 |
References
- https://www.veeam.com/kb4126Release Notes, Vendor Advisory
- https://www.veeam.com/kb4180Release Notes, Vendor Advisory
- https://www.veeam.com/kb4126Release Notes, Vendor Advisory
- https://www.veeam.com/kb4180Release Notes, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-35971?
Veeam Backup and Replication 10 before 10.0.1.4854 P20210609 and 11 before 11.0.0.837 P20210507 mishandles deserialization during Microsoft .NET remoting.
How severe is CVE-2021-35971?
CVE-2021-35971 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.24% probability of exploitation in the next 30 days.
How do I fix CVE-2021-35971?
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-2021-35971?
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Scan your code nowSource: NVD / NIST