Is CVE-2021-35971 actively exploited?

No active exploitation of CVE-2021-35971 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-35971 be exploited remotely?

Yes. CVE-2021-35971 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-35971?

CVE-2021-35971 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-35971

CRITICAL

CVE-2021-35971

CWE-502Published: June 30, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-35971 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.