CVE-2025-23120Public exploitNetwork attack vector

Authenticated code execution via denylisted BinaryFormatter gadgets

Published Mar 20, 2025 · Updated Mar 20, 2025

Deserialization in Veeam Backup & Replication 12.3.0.310 and earlier allows remote authenticated users to execute code on the backup server. The Veeam Mount Service passes attacker-controlled xmlFrameworkDs or BackupSummary DataSet objects to BinaryFormatter under an incomplete type denylist. Any domain user can reach this sink when the Windows backup server is domain joined and obtain code execution on that server.

CVSS severity9.9
Critical
EPSS probability24.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Deserialization in Veeam Backup & Replication 12.3.0.310 and earlier allows remote authenticated users to execute code on the backup server. The Veeam Mount Service passes attacker-controlled xmlFrameworkDs or BackupSummary DataSet objects to BinaryFormatter under an incomplete type denylist. Any domain user can reach this sink when the Windows backup server is domain joined and obtain code execution on that server.

The record

CVE
CVE-2025-23120
Published
Mar 20, 2025
Updated
Mar 20, 2025
Vendor
Paragon Software Group
Product
Backup & Recovery
Classifications
CWE-502, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.3 <=12.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Paragon Software Group · Backup & Recoveryversion=12.3 <=12.3

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.9HackerOne CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo