CVE-2025-3939: tridium niagara Observable Response Discrepancy
Vulnerability summary
CVE-2025-3939 is a medium (CVSS 5.3) Observable Response Discrepancy vulnerability in tridium niagara. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.7% of scored vulnerabilities.
Timeline
- 22-05-2025PublishedVulnerability first disclosed.
- 22-05-2025Last modifiedVulnerability information updated.
Description
Observable Response Discrepancy vulnerability in Tridium Niagara Framework on Windows, Linux, QNX, Tridium Niagara Enterprise Security on Windows, Linux, QNX allows Cryptanalysis. This issue affects Niagara Framework: before 4.14.2, before 4.15.1, before 4.10.11; Niagara Enterprise Security: before 4.14.2, before 4.15.1, before 4.10.11.Tridium recommends upgrading to Niagara Framework and Enterprise Security versions 4.14.2u2, 4.15.u1, or 4.10u.11.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS trend
Probability
0.33%
Chance of exploitation in the next 30 days
Percentile
25%
Versus all other CVEs
30-day change
+0.01 pp
From 0.32% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-204Observable Response DiscrepancyThe product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.
- CWE-203Observable DiscrepancyThe product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.
Affected systems
Tridium3 products
- niagara4.10u10 | 4.14u1 | 4.15
- niagara_enterprise_security< 4.14.2 | < 4.15.1 | < 4.10.11 | 4.10u10 | 4.14u1 | 4.15
- niagara framework< 4.14.2 | < 4.15.1 | < 4.10.11
1 vendor · 3 products
References
2 links- honeywell.com/us/en/product-securityVendor Advisory