CVE-2021-47726Public exploitNetwork attack vector

Administrator credential disclosure via configuration backup endpoint

Published Dec 31, 2025 · Updated Dec 31, 2025

Credential exposure in NuCom 11N Wireless Router 5.07.90 allows remote authenticated users to retrieve the administrator password. The /cgi-bin/DownloadNoMacaddrCfg/RouterCfm.cfg endpoint accepts the default user's ecos_pw cookie and returns http_supper_passwd as a Base64-encoded value. Default user access is sufficient; decoding the value yields the administrator credential and grants access to privileged management pages.

CVSS severity8.7
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential exposure in NuCom 11N Wireless Router 5.07.90 allows remote authenticated users to retrieve the administrator password. The /cgi-bin/DownloadNoMacaddrCfg/RouterCfm.cfg endpoint accepts the default user's ecos_pw cookie and returns http_supper_passwd as a Base64-encoded value. Default user access is sufficient; decoding the value yields the administrator credential and grants access to privileged management pages.

The record

CVE
CVE-2021-47726
Published
Dec 31, 2025
Updated
Dec 31, 2025
Vendor
NuCom
Product
NuCom 11N Wireless Router
Classifications
CWE-522, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 31, 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=5.07.90

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

NuCom · NuCom 11N Wireless Routerversion=5.07.90

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.5VulnCheckCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
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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