CVE-2025-34155Network attack vector

Account enumeration via distinct login failure responses

Published Oct 23, 2025 · Updated May 14, 2026

User enumeration in Tibbo Systems AggreGate Network Manager before 6.40.05 allows remote attackers to infer valid account names. The login function returns different authentication-failure messages depending on whether the supplied username exists. No authentication is required; the disclosure exposes account identifiers that can focus brute-force or credential-stuffing attempts.

CVSS severity6.9
Medium
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

User enumeration in Tibbo Systems AggreGate Network Manager before 6.40.05 allows remote attackers to infer valid account names. The login function returns different authentication-failure messages depending on whether the supplied username exists. No authentication is required; the disclosure exposes account identifiers that can focus brute-force or credential-stuffing attempts.

The record

CVE
CVE-2025-34155
Published
Oct 23, 2025
Updated
May 14, 2026
Vendor
Tibbo Systems
Product
AggreGate Network Manager
Classifications
CWE-204, CAPEC-332, CAPEC-580, CAPEC-331, CAPEC-541, T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 23, 2025CVE publishedPublication date reported by the CVE source.
  2. May 14, 2026Record 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=0 <6.40.05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tibbo Systems · AggreGate Network Managerversion=0 <6.40.05

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

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
CAPEC-332ICMP IP 'ID' Field Error Message Probe
CAPEC-580System Footprinting
CAPEC-331ICMP IP Total Length Field Probe
CAPEC-541Application Fingerprinting
T1087Account Discovery

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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