How severe is CVE-2025-34155?

CVE-2025-34155 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2025-34155 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-34155?

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

Does CVE-2025-34155 have an EU (EUVD) identifier?

Yes. CVE-2025-34155 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35703.

When was CVE-2025-34155 published?

CVE-2025-34155 was published on 2025-10-23 and last updated on 2026-06-17.

CVE-2025-34155

CVE-2025-34155 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. 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 4.0 base score 6.9)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-35703
Weakness: CWE-204
Published: 2025-10-23
Last modified: 2026-06-17

Description

Tibbo AggreGate Network Manager < 6.40.05 contains an observable response discrepancy in its login functionality. Authentication failure messages differ based on whether a supplied username exists or not, allowing an unauthenticated remote attacker to infer valid account identifiers. This can facilitate user enumeration and increase the likelihood of targeted brute-force or credential-stuffing attacks.

Frequently asked questions

What is CVE-2025-34155?: Tibbo AggreGate Network Manager < 6.40.05 contains an observable response discrepancy in its login functionality. Authentication failure messages differ based on whether a supplied username exists or not, allowing an unauthenticated remote attacker to infer valid account identifiers. This can facilitate user enumeration and increase the likelihood of targeted brute-force or credential-stuffing attacks.
How severe is CVE-2025-34155?: CVE-2025-34155 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2025-34155 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-34155?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-34155 have an EU (EUVD) identifier?: Yes. CVE-2025-34155 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35703.
When was CVE-2025-34155 published?: CVE-2025-34155 was published on 2025-10-23 and last updated on 2026-06-17.

References

Other CWE-204 vulnerabilities

CVE-2018-25350 — Critical (CVSS 9.8): userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discover valid…
CVE-2025-5485 — High (CVSS 8.6): User names used to access the web management interface are limited to the device identifier, which is a numerical…
CVE-2026-33419 — High (CVSS 7.5): MinIO is a high-performance object storage system. Prior to RELEASE.2026-03-17T21-25-16Z, MinIO AIStor's STS (Security…
CVE-2025-12455 — High (CVSS 7.5): Observable response discrepancy vulnerability in OpenText™ Vertica allows Password Brute Forcing. The…
CVE-2025-46390 — High (CVSS 7.5): CWE-204: Observable Response Discrepancy
CVE-2025-3092 — High (CVSS 7.5): An unauthenticated remote attacker can enumerate valid user names from an unprotected endpoint.

Browse all CWE-204 vulnerabilities →