CVE-2021-28150Public exploitNetwork attack vector

Administrator-password disclosure via unprotected backup endpoint

Published May 6, 2021 · Updated Aug 3, 2024

Information disclosure in Hongdian H8922 3.0.5 allows remote authenticated users to read administrator credentials via /backup2.cgi. The backup2.cgi handler lets the guest account directly download cli.conf without enforcing authorization for that configuration file. Guest credentials are required, and the exposed administrator password and other sensitive settings enable higher-privilege access.

CVSS severity5.5
Medium
EPSS probability2.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Hongdian H8922 3.0.5 allows remote authenticated users to read administrator credentials via /backup2.cgi. The backup2.cgi handler lets the guest account directly download cli.conf without enforcing authorization for that configuration file. Guest credentials are required, and the exposed administrator password and other sensitive settings enable higher-privilege access.

The record

CVE
CVE-2021-28150
Published
May 6, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-425, CAPEC-87, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-425Direct Request ('Forced Browsing')
CAPEC-87Forceful Browsing
T1552.001Unsecured Credentials: Credentials In Files

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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