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CVE-2026-21666 is a critical vulnerability in the Backup Server component of Veeam Backup & Replication that allows an authenticated domain user to achieve remote code execution. The flaw is caused by improper neutralization of carriage return and line feed (CRLF) sequences in user-supplied input. When the Backup Server processes authenticated requests containing configuration parameters for connected Linux-based Backup Proxies or Hardened Repositories, it dynamically constructs service execution files or environment variables from that input without safely stripping or encoding newline-related sequences. An attacker can inject CRLF characters to terminate an intended single configuration directive and introduce additional directives. This can result in attacker-controlled commands being incorporated into service configuration or execution context and subsequently executed by the host operating system with the privileges of the affected service.
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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.
27 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 execute arbitrary commands on a Veeam Backup Server.
A critical remote code execution vulnerability in Veeam Backup & Replication that allows an authenticated domain user to execute arbitrary code on the Veeam Backup Server.
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.