CVE-2020-25218Network attack vector

Unauthenticated admin access via direct-login API

Published Mar 29, 2021 · Updated Aug 4, 2024

Authentication bypass in Grandstream GRP261x VoIP phone firmware 1.0.3.6 allows remote attackers to access the administrative web interface. The /cgi-bin/direct-login endpoint accepts HTTP GET requests without credentials and returns a session-identity cookie for the admin web role. Any attacker with network access can obtain administrative control; combining this bypass with CVE-2020-25217 enables root command execution.

CVSS severity9.8
Critical
EPSS probability1.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Grandstream GRP261x VoIP phone firmware 1.0.3.6 allows remote attackers to access the administrative web interface. The /cgi-bin/direct-login endpoint accepts HTTP GET requests without credentials and returns a session-identity cookie for the admin web role. Any attacker with network access can obtain administrative control; combining this bypass with CVE-2020-25217 enables root command execution.

The record

CVE
CVE-2020-25218
Published
Mar 29, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

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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