CVE-2025-34153

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 53% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
10.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 10.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Hyland OnBase versions prior to 17.0.2.87 (other versions may be affected) are vulnerable to unauthenticated remote code execution via insecure deserialization on the .NET Remoting TCP channel. The service registers a listener on port 6031 with the URI endpoint TimerServer, implemented in Hyland.Core.Timers.dll. This endpoint deserializes untrusted input using the .NET BinaryFormatter, allowing attackers to execute arbitrary code under the context of NT AUTHORITY\SYSTEM.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
76(Attend)
EG Risk 76/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
47.6%
KEV
Not listed

Published

August 13, 2025

Last Modified

April 15, 2026

Advisory Details (4)

Auto-updated Jul 25, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Hyland OnBase < 17.0.2.87 .NET Remoting TCP Channel Unauthenticated RCE | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hyland-onbase-net-remoting-tcp-channel-unauthenticated-rce
generic

OnBase Unity Client | Efficient Content Management | Hyland

https://www.hyland.com/en/internal/onbase-unity-client
generic

Product Documentation

https://support.hyland.com/r/OnBase/WorkView/Foundation-24.1/WorkView/Installation/Upgrade-Considerations/Upgrading-to-OnBase-Version-Foundation-24.1
generic🟡 PoC Available

HylandSoftware-Onbase-Deserialization RCE.md · GitHub

https://gist.github.com/VAMorales/32794cccc2195a935623a12ef32760dc

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 127 total refreshes for this CVE.

  1. 2026-07-25 14:17 UTCEPSS rescore
  2. 2026-07-25 14:17 UTCEPSS rescore
  3. 2026-07-24 14:17 UTCEPSS rescore
  4. 2026-07-23 02:54 UTCEG score recompute
  5. 2026-07-22 14:07 UTCEPSS rescore
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  1. 2026-07-09 19:09 UTCEPSS rescore
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  25. 2026-06-23 21:32 UTCEPSS rescore
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  27. 2026-06-22 14:25 UTCEPSS rescore
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  29. 2026-06-21 14:56 UTCEPSS rescore
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  31. 2026-06-21 01:59 UTCEPSS rescore
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  42. 2026-06-12 23:11 UTCEPSS rescore
  43. 2026-06-11 13:59 UTCEPSS rescore
  44. 2026-06-10 22:18 UTCEPSS rescore
  45. 2026-06-10 13:22 UTCEPSS rescore
  46. 2026-06-08 15:46 UTCEG score recompute▲ 10.00
  47. 2026-06-08 15:46 UTCGHSA enrichment
  48. 2026-06-08 14:16 UTCEPSS rescore
  49. 2026-06-08 14:16 UTCEPSS rescore
  50. 2026-06-07 15:24 UTCEPSS rescore
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  52. 2026-06-06 13:47 UTCEPSS rescore
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  54. 2026-06-05 22:46 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-34153?
CVE-2025-34153 is a critical vulnerability published on August 13, 2025. Hyland OnBase versions prior to 17.0.2.87 (other versions may be affected) are vulnerable to unauthenticated remote code execution via insecure deserialization on the .NET Remoting TCP channel. The service registers a listener on port 6031 with the URI endpoint TimerServer, implemented in…
When was CVE-2025-34153 disclosed?
CVE-2025-34153 was first published in the National Vulnerability Database on August 13, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-34153 actively exploited?
CVE-2025-34153 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-34153?
CVE-2025-34153 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2025-34153?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-34153, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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