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Fencer Vulns
critical 9.8

CVE-2024-40711 kev+ ransomware in the critical feed json

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

published 2024-09-07 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-38578

cvss
9.8
version 3.0, CNA
cisa kev
Exploited
added 2024-10-17, used in ransomware
epss
90.4%
EPSS 90.4% chance of exploitation in 30 days, percentile 99.8%
public exploits
0
none known, plus a Nuclei check

Summary

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

Patch / fix

cisa required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  • veeam veeam_backup_&_replication 12.2.0.334

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA SSVC: exploitation active
  4. CISA patch deadline

Known exploited

Added
2 y ago
Patch by
2024-11-07 (2 y ago)
Ransomware
Known to be used in ransomware campaigns
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor, product
Veeam, Backup & Replication
CISA name
Veeam Backup and Replication Deserialization Vulnerability

Ransomware

Groups reported to have exploited it in intrusions.

  • Akira ransomware gang
  • Fog ransomware gang

reported by infosec.exchange

Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

90.37% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Veeam Backup & Replication - Unauthenticated nuclei detection template
  • labs.watchtowr.com https://labs.watchtowr.com/veeam-backup-response-rce-with-auth-but-mostly-without-auth-cve-2024-40711-2/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Veeam Backup and Recovery
  • veeam backup_\&_replication

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.