CVE-2025-3939: Observable Response Discrepancy vulnerability in Tridium Niagara Framework on Windows, Linux, QNX, Tridium Nia

Routine

MEDIUM 5.3REMOTEWATCHLISTDOWNGRADEDOWNGRADE

CVE-2025-3939 is a medium-severity flaw (CVSS 5.3) affecting niagara, niagara enterprise security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.1

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-204, CWE-203
Published	2025-05-22
Last modified	2026-06-17

Publisher (CNA): Honeywell International Inc. · Vendor: tridium

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-22 13:15 UTCPublished CVE record published
2026-06-17 09:20 UTCUpdated Record last modified

tridium niagara DOWNGRADE

Affected: 4.10u10 · 4.14u1 · 4.15

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.10u10

1. Check installed version

apt-cache policy niagara || rpm -q niagara || niagara --version

2. No fixed release: DOWNGRADE to a release before 4.10u10 (Debian / Ubuntu)

apt-cache madison niagara sudo apt install niagara=<VERSION_BEFORE_4.10u10> sudo apt-mark hold niagara

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list niagara sudo dnf downgrade niagara-<VERSION_BEFORE_4.10u10> sudo dnf versionlock add niagara

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

tridium niagara enterprise security DOWNGRADE

Affected: 4.10u10 · 4.14u1 · 4.15

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.10u10

1. Check installed version

apt-cache policy niagara-enterprise-security || rpm -q niagara-enterprise-security || niagara-enterprise-security --version

2. No fixed release: DOWNGRADE to a release before 4.10u10 (Debian / Ubuntu)

apt-cache madison niagara-enterprise-security sudo apt install niagara-enterprise-security=<VERSION_BEFORE_4.10u10> sudo apt-mark hold niagara-enterprise-security

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list niagara-enterprise-security sudo dnf downgrade niagara-enterprise-security-<VERSION_BEFORE_4.10u10> sudo dnf versionlock add niagara-enterprise-security

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-3939?

niagara: downgrade or apply the listed mitigation; niagara enterprise security: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-3939 being exploited?

CVE-2025-3939 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-3939 affect?

CVE-2025-3939 affects niagara, niagara enterprise security. Severity is medium (CVSS 5.3). 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

How urgent is CVE-2025-3939?

Priority 35/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

Windows vulnerabilities

Related CVEs

CVE-2025-3945 HIGH 7.2 DOWNGRADE DOWNGRADE Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') vulnerability in Tridium Ni
CVE-2025-3944 HIGH 7.2 DOWNGRADE DOWNGRADE Incorrect Permission Assignment for Critical Resource vulnerability in Tridium Niagara Framework on QNX, Tridi
CVE-2025-3943 MEDIUM 4.1 DOWNGRADE DOWNGRADE Use of GET Request Method With Sensitive Query Strings vulnerability in Tridium Niagara Framework on Windows,
CVE-2025-3942 MEDIUM 4.3 DOWNGRADE DOWNGRADE Improper Output Neutralization for Logs vulnerability in Tridium Niagara Framework on Windows, Linux, QNX, Tri
CVE-2025-3941 MEDIUM 5.4 DOWNGRADE DOWNGRADE Improper Handling of Windows ::DATA Alternate Data Stream vulnerability in Tridium Niagara Framework on Window

References

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