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CVE-2021-35971

31
FAUCET Score

CVE-2021-35971 is a critical deserialization vulnerability affecting Veeam Backup & Replication versions 10 (prior to 10.0.1.4854 P20210609) and 11 (prior to 11.0.0.837 P20210507). This flaw, rated 9.8 CVSS (Critical), allows an unauthenticated attacker to achieve remote code execution over the network with low attack complexity, leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
>= 10.0, < 10.0.1.4854CPE matchmatch criteria
cpe:2.3:a:veeam:veeam_backup_\&_replication:*:*:*:*:*:*:*:*
>= 11.0, < 11.0.0.837CPE matchmatch criteria
cpe:2.3:a:veeam:veeam_backup_\&_replication:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.24%
Probability of exploitation in next 30 days
EPSS Percentile
66.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0124 is in the 52nd percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

veeam.com / kb4126
Release NotesVendor Advisory
veeam.com / kb4180
Release NotesVendor Advisory