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CVE-2025-23120 is a critical remote code execution vulnerability in Veeam Backup & Replication affecting version 12.x builds up to and including 12.3.0.310, specifically in domain-joined deployments. The issue is rooted in insecure deserialization in Veeam’s .NET Remoting interface exposed over TCP port 9401. According to the provided content, Veeam relied on a blocklist-based approach for deserialization controls, but certain classes, including Veeam.Backup.EsxManager.xmlFrameworkDs and Veeam.Backup.Core.BackupSummary, were not properly blocked, and CDbCryptoKeyInfo enabled inner deserialization. An authenticated domain user can send a crafted serialized payload to the vulnerable remoting service and achieve arbitrary code execution on the backup server.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Veeam Backup & Replication vulnerability enabling remote code execution by authenticated domain users.
A critical remote code execution vulnerability in Veeam Backup & Replication allowing authenticated domain users to execute code remotely.
A critical remote code execution vulnerability in Veeam Backup & Replication software addressed in March 2025.
A previously disclosed critical deserialization vulnerability in Veeam Backup & Replication that allowed remote code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.