How severe is CVE-2025-34254?

CVE-2025-34254 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2025-34254 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-34254?

CVE-2025-34254 affects Dlink Nuclias Connect. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-34254?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-34254 have an EU (EUVD) identifier?

Yes. CVE-2025-34254 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34831.

When was CVE-2025-34254 published?

CVE-2025-34254 was published on 2025-10-16 and last updated on 2026-06-17.

CVE-2025-34254

CVE-2025-34254 is a medium-severity vulnerability in Dlink Nuclias Connect with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-204.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-34831
Weakness: CWE-204
Affected product: Dlink Nuclias Connect
Published: 2025-10-16
Last modified: 2026-06-17

Description

D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain an observable response discrepancy vulnerability. The application's 'Login' endpoint returns distinct JSON responses depending on whether the supplied username is associated with an existing account. Because the responses differ in the `error.message`string value, an unauthenticated remote attacker can enumerate valid usernames/accounts on the server. NOTE: D-Link states that a fix is under development.

Frequently asked questions

What is CVE-2025-34254?: D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain an observable response discrepancy vulnerability. The application's 'Login' endpoint returns distinct JSON responses depending on whether the supplied username is associated with an existing account. Because the responses differ in the `error.message`string value, an unauthenticated remote attacker can enumerate valid usernames/accounts on the server. NOTE: D-Link states that a fix is under development.
How severe is CVE-2025-34254?: CVE-2025-34254 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2025-34254 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-34254?: CVE-2025-34254 affects Dlink Nuclias Connect. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-34254?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-34254 have an EU (EUVD) identifier?: Yes. CVE-2025-34254 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34831.
When was CVE-2025-34254 published?: CVE-2025-34254 was published on 2025-10-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:dlink:nuclias_connect:*:*:*:*:*:*:*:*

More vulnerabilities in Dlink Nuclias Connect

CVE-2025-34253 — Medium (CVSS 5.4): D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain a stored cross-site scripting (XSS) vulnerability due to…
CVE-2025-34255 — Medium (CVSS 5.3): D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain an observable response discrepancy vulnerability. The…

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CVE-2025-46390 — High (CVSS 7.5): CWE-204: Observable Response Discrepancy
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