CVE-2025-34153Public exploitNetwork attack vector

Unauthenticated code execution via BinaryFormatter deserialization

Published Aug 13, 2025 · Updated May 15, 2026

Insecure deserialization in Hyland OnBase before 17.0.2.87 allows remote attackers to execute arbitrary code without authentication. The TimerServer endpoint in Hyland.Core.Timers.dll passes untrusted requests from the .NET Remoting TCP channel to BinaryFormatter. Access to TCP port 6031 is sufficient to run code as NT AUTHORITY\SYSTEM, enabling complete compromise of the hosting Windows server.

CVSS severity10.0
Critical
EPSS probability0.65%
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

Insecure deserialization in Hyland OnBase before 17.0.2.87 allows remote attackers to execute arbitrary code without authentication. The TimerServer endpoint in Hyland.Core.Timers.dll passes untrusted requests from the .NET Remoting TCP channel to BinaryFormatter. Access to TCP port 6031 is sufficient to run code as NT AUTHORITY\SYSTEM, enabling complete compromise of the hosting Windows server.

The record

CVE
CVE-2025-34153
Published
Aug 13, 2025
Updated
May 15, 2026
Vendor
Hyland
Product
OnBase
Classifications
CWE-502, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2025CVE publishedPublication date reported by the CVE source.
  2. May 15, 2026Record 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=0 <17.0.2.87

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hyland · OnBaseversion=0 <17.0.2.87

Published CVSS scores

10.0VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
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