CVE-2025-52916Network attack vector

Serial-number PIN disclosure via unlimited verification attempts

Published Jun 21, 2025 · Updated Jul 28, 2025

Improper attempt limiting in Yealink RPS before 2025-06-04 allows remote authenticated users to enumerate a device's serial-number PIN. The serial-number verification flow accepts repeated guesses without rate limiting or brute-force protection, exposing the final five digits used as a second authentication factor. Access requires high privileges, and the bounded consequence is disclosure of that device-specific PIN.

CVSS severity2.2
Low
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper attempt limiting in Yealink RPS before 2025-06-04 allows remote authenticated users to enumerate a device's serial-number PIN. The serial-number verification flow accepts repeated guesses without rate limiting or brute-force protection, exposing the final five digits used as a second authentication factor. Access requires high privileges, and the bounded consequence is disclosure of that device-specific PIN.

The record

CVE
CVE-2025-52916
Published
Jun 21, 2025
Updated
Jul 28, 2025
Vendor
Yealink
Product
Yealink RPS (Redirection and Provisioning Service)
Classifications
CWE-307, T1110.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=0 <2025-06-04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Yealink · Yealink RPS (Redirection and Provisioning Service)version=0 <2025-06-04

Published CVSS scores

2.2MITRECVSS:3.1/AV:N/AC:H/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110.001Password Guessing

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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