What’s Vulnerable › Vulnerabilities

CVE-2021-35971

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-30 · updated 2026-06-17
• Weakness: CWE-502

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.

Affected products

• Veeam Backup & Replication: from 10.0 before 10.0.1.4854; from 11.0 before 11.0.0.837 — fixed in 10.0.1.4854, 11.0.0.837

How to fix

Upgrade to a fixed version: Veeam Backup & Replication 10.0.1.4854, 11.0.0.837. Check the vendor advisory for mitigations.

References

• https://www.veeam.com/kb4126
• https://www.veeam.com/kb4180
• https://www.veeam.com/kb4126
• https://www.veeam.com/kb4180

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