CVE-2020-5726Public exploitNetwork attack vector

Password disclosure via CTI challenge SQL injection

Published Mar 30, 2020 · Updated Aug 4, 2024

SQL injection in Grandstream UCM6200 Series 1.0.20.20 and earlier allows remote attackers to read user passwords through port 8888. The CTI server's challenge action inserts the unauthenticated username into a users-table query, and response differences expose password values. Network access to the CTI service is sufficient; no account is required, and disclosure can compromise PBX user credentials.

CVSS severity7.5
High
EPSS probability4.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Grandstream UCM6200 Series 1.0.20.20 and earlier allows remote attackers to read user passwords through port 8888. The CTI server's challenge action inserts the unauthenticated username into a users-table query, and response differences expose password values. Network access to the CTI service is sufficient; no account is required, and disclosure can compromise PBX user credentials.

The record

CVE
CVE-2020-5726
Published
Mar 30, 2020
Updated
Aug 4, 2024
Vendor
Grandstream Networks
Product
UCM6200 Series
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2020CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.20.20 and below

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Grandstream Networks · UCM6200 Seriesversion=1.0.20.20 and below

Published CVSS scores

5.0Tenable Network SecurityAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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.

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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-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

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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