Critical

Remote Code Execution in Veeam Backup & Replication Backup Server

IdentifiersCVE-2026-21669CWE-306

CVE-2026-21669 is a critical remote code execution vulnerability in Veeam Backup & Replication affecting the Backup Server. According to the provided content, the flaw exists in Veeam Backup & Replication 13.0.1.2067 context and allows an authenticated domain user, including a low-privileged domain user, to execute code remotely on the Backup Server. The available material does not identify the specific vulnerable function, component, or root cause, but it consistently describes the issue as a low-complexity RCE path against vulnerable backup server deployments.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows remote code execution on the Veeam Backup Server by an authenticated domain user. Because the target is backup infrastructure, compromise could enable an attacker to take control of systems that store or manage critical organizational backup data, potentially facilitating follow-on actions such as disruption of recovery operations, access to protected backup data, and broader intrusion activity. The provided content assigns the vulnerability a CVSS score of 9.9, indicating critical severity.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure of the Backup Server to authenticated domain users, especially low-privileged accounts, and restrict access paths to backup infrastructure as much as operationally feasible. Prioritize isolation and hardening of backup servers, monitor for suspicious activity by domain accounts against Veeam systems, and accelerate patch deployment because the vendor warned that attackers may reverse-engineer the fixes to target unpatched deployments. No vulnerability-specific workaround beyond upgrading is provided in the supplied content.

Remediation

Patch, then assume compromise.

Upgrade Veeam Backup & Replication to a fixed release. The provided content states that CVE-2026-21669 is fixed in Veeam Backup & Replication version 13.0.1.2067. Veeam also published security update KB 4830 on March 12, 2026, and advised users to update instances to the latest version as soon as possible due to the likelihood of patch reverse engineering and rapid exploitation of unpatched systems.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Veeam SoftwareBackup & Replicationapplication

Veeam SoftwareVeeam Backup & Replicationapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

11 SOURCESView more in app

thecyberexpress com vulnerabilitiesNews

Mar 13, 2026

Veeam Security Patch Fixes Critical RCE In Backup Platform

A critical remote code execution vulnerability in Veeam Backup & Replication that allows an authenticated domain user to perform remote code execution on the Backup Server.

the hacker newsNews

Mar 13, 2026

Veeam Patches 7 Critical Backup & Replication Flaws Allowing Remote Code Execution

A critical remote code execution vulnerability in Veeam Backup & Replication that allows an authenticated domain user to execute code on the Backup Server.

bleeping computerNews

Mar 12, 2026

Veeam warns of critical flaws exposing backup servers to RCE attacks

A critical remote code execution vulnerability in Veeam Backup & Replication that allows low-privileged domain users to execute code remotely against vulnerable backup servers.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity7

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-21669

NVD

nvd.nist.gov/vuln/detail/CVE-2026-21669