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Vulnerabilities

Vulnerability · CVE-2025-34254

D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain an observable response discrepancy vulnerability.

Published Oct 16, 2025 · catalog updated May 25, 2026 · D-Link Nuclias Connect

Last checked Oct 27, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-34254. EPSS is 1.02%. Act only if a listed version of D-Link Nuclias Connect is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.02%
Remediation
Advisory link
Affected products
vendor D-Link Nuclias Connect 0 ≤1.3.1.4

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 string value, an unauthenticated remote attacker can enumerate valid usernames/accounts on the server. NOTE: D-Link states that a fix is under development.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor D-Link Nuclias Connect 0 ≤1.3.1.40 ≤1.3.1.4

How to fix CVE-2025-34254

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-34254. EPSS is 1.02%. Act only if a listed version of D-Link Nuclias Connect is installed.

Which versions are affected?

Compare what you have installed with D-Link Nuclias Connect 0 ≤1.3.1.4 0 ≤1.3.1.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.02%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 16, 2025 · EUVD

    Detected

    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 string value, an unauthenticated remote attacker can enumerate valid usernames/accounts on the server. N

  2. May 25, 2026 · EUVD

    Updated

    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 string value, an unauthenticated remote attacker can enumerate valid usernames/accounts on the server. N

Sources

  • CVE.orgVulnerability recordCVE-2025-34254

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-34254

    30-day exploitation probability 1.02%

    first.org
  • EUVDVulnerability recordEUVD-2025-34831

    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 response

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 27, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 27, 2026
  • CVE.orgOct 24, 2026
  • EUVDOct 23, 2026