CVE-2025-28172Public exploitNetwork attack vector

Account takeover via unlimited password guesses

Published Jul 29, 2025 · Updated Jul 5, 2026

Improper authentication throttling in Grandstream Networks UCM6510 1.0.20.52 and earlier allows remote attackers to access accounts. The login authentication handler accepts unlimited password guesses instead of enforcing the documented failed-attempt limit and IP ban. No prior authentication or user interaction is required, but account access depends on guessing a valid password.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication throttling in Grandstream Networks UCM6510 1.0.20.52 and earlier allows remote attackers to access accounts. The login authentication handler accepts unlimited password guesses instead of enforcing the documented failed-attempt limit and IP ban. No prior authentication or user interaction is required, but account access depends on guessing a valid password.

The record

CVE
CVE-2025-28172
Published
Jul 29, 2025
Updated
Jul 5, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-307, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 5, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

Public exploit references

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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