---
title: "CVE-2024-40711: Veeam Backup and Replication Deserialization Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-40711/
description: "CVE-2024-40711 (Veeam Backup & Replication): Exploited in the wild (CISA KEV). A deserialization of untrusted data vulnerability with a malicious payload…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-09-07
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-40711"
kev: true
cvss: 9.8
epss: 0.90369
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-40711: Veeam Backup and Replication Deserialization Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Veeam Backup & Replication. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-10-17, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-11-07 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 90.4% , percentile 99.8: FIRST’s model estimates a 90.4% chance of exploitation activity in the next 30 days, higher than 99.8% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Act now. Veeam Backup & Replication RCE (CVE-2024-40711) — Ransomware crews have used this to take over backup servers; any Veeam Backup & Replication v12 server below 12.2 is an emergency, and backup servers should never be reachable from user or internet networks.

## What it is

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

## Affected products (CVE record)

- Veeam Backup and  Recovery: 12.1.2 <= 12.1.2

## Severity

- hackerone CVSS 3.0: 9.8 `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2024-10-17; federal due date 2024-11-07. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 90.37% probability of exploitation activity in the next 30 days; percentile 99.8.

## Sources

- [Listed in CISA KEV notes (veeam.com)](https://www.veeam.com/kb4649)
- [CVE.org record CVE-2024-40711](https://www.cve.org/CVERecord?id=CVE-2024-40711)
- [NVD entry CVE-2024-40711](https://nvd.nist.gov/vuln/detail/CVE-2024-40711)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-40711)
- [labs.watchtowr.com](https://labs.watchtowr.com/veeam-backup-response-rce-with-auth-but-mostly-without-auth-cve-2024-40711-2/)

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Source page: https://erroneo.us/security/cve/CVE-2024-40711/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt