CVE-2025-34255Network attack vector

Unauthenticated account enumeration via Forgot Password response

Published Oct 16, 2025 · Updated Oct 16, 2025

Observable response discrepancy in D-Link Nuclias Connect 1.3.1.4 and earlier allows remote attackers to enumerate valid accounts. The Forgot Password endpoint sets data.exist differently for registered and unregistered email addresses. No authentication is required, and the response oracle discloses account membership for submitted email addresses.

CVSS severity6.9
Medium
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Observable response discrepancy in D-Link Nuclias Connect 1.3.1.4 and earlier allows remote attackers to enumerate valid accounts. The Forgot Password endpoint sets data.exist differently for registered and unregistered email addresses. No authentication is required, and the response oracle discloses account membership for submitted email addresses.

The record

CVE
CVE-2025-34255
Published
Oct 16, 2025
Updated
Oct 16, 2025
Vendor
D-Link
Product
Nuclias Connect
Classifications
CWE-204, T1589.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <1.3.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · Nuclias Connectversion=* <1.3.1.4

Published CVSS scores

6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-204Observable Response Discrepancy
T1589.002Gather Victim Identity Information: Email Addresses

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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