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CVE-2025-23121 is a critical remote code execution vulnerability in Veeam Backup & Replication affecting domain-joined Backup Server deployments. The flaw allows an authenticated Active Directory domain user to remotely execute arbitrary code on the backup server. Available reporting indicates the issue is likely a bypass of the earlier CVE-2025-23120 fix and is associated with insecure deserialization behavior involving Microsoft BinaryFormatter in Veeam Backup & Replication version 12 builds, including 12.3.1.1139 and earlier affected releases. The vulnerability is exposed only when the Backup Server is joined to a Windows domain.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
55 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remote code execution vulnerability in Veeam Backup & Replication that can allow remote attackers to execute arbitrary code under certain conditions.
A critical Veeam Backup & Replication vulnerability that allows remote code execution on the backup server by an authenticated domain user; patched by Veeam.
A critical RCE vulnerability in Veeam Backup & Replication affecting domain-joined servers, allowing any authenticated AD user to execute arbitrary code.
A critical remote code execution vulnerability in Veeam Backup & Replication that can be exploited by a remote authenticated domain user on domain-joined instances, potentially leading to full compromise of confidentiality, integrity, and availability.
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.