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CVE-2026-21667 is a critical remote code execution vulnerability in the Backup Server component of Veeam Backup & Replication. It affects version 12.3.2.4165 and earlier releases in the 12.x branch. Successful exploitation allows an authenticated domain user, including a low-privileged domain user, to execute code remotely on the Backup Server. Publicly available information identifies the impact and affected component, but does not provide sufficient technical detail about the specific vulnerable function or root cause.
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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.
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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.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical remote code execution vulnerability in the Veeam Backup & Replication Backup Server component allowing an authenticated domain user to execute code remotely.
A critical remote code execution vulnerability in Veeam Backup & Replication that allows an authenticated domain user to achieve remote code execution on the Backup Server.
A critical remote code execution vulnerability in Veeam Backup & Replication that allows an authenticated domain user to trigger RCE on the Backup Server, potentially leading to full system compromise.
A critical remote code execution vulnerability in Veeam Backup & Replication that allows an authenticated domain user to execute code on the Backup Server.
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.