CVE-2024-40711 — Backup \& Replication
CVE-2024-40711 is a Deserialization of Untrusted Data vulnerability in veeam backup \& replication. It is in CISA's Known Exploited Vulnerabilities catalog (added 2024-10-17) and has been used in ransomware campaigns — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.
A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2024-10-17 — including use in ransomware campaigns. Federal agencies were required to remediate by 2024-11-07.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2024-40711.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
Description
A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).
Affected Products
backup \& replicationveeamResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
A deserialization of untrusted data vulnerability with a malicious paylo…
A deserialization of untrusted data vulnerability with a malicious paylo…
A deserialization of untrusted data vulnerability with a malicious paylo…
A deserialization of untrusted data vulnerability with a malicious paylo…
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every veeam backup \& replication deployment and check each version against the affected-products list above.
Remediation status
No patch has shipped for CVE-2024-40711 yet — track the veeam backup \& replication advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
How to detect CVE-2024-40711
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2024-40711 -u https://target- Template
- Veeam Backup & Replication - Unauthenticated
- Severity
- critical
- Impact
- Unauthenticated attackers can exploit deserialization vulnerabilities to achieve remote code execution on Veeam Backup & Replication servers.
- Remediation
- Update Veeam Backup & Replication to a patched version addressing CVE-2024-40711.
Template by ProjectDiscovery nuclei-templates (rootxharsh, iamnoooob, DhiyaneshDK), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2024-40711 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.