CVE-2021-39291Public exploitNetwork attack vector

Account takeover via logged CLI-PHP credentials

Published Aug 23, 2021 · Updated Aug 4, 2024

Credential exposure in NetModule Router Software before 4.3.0.113, 4.4.0.111, and 4.5.0.105 allows attackers to take over accounts. The optional CLI-PHP webshell accepts a username and password in URL query parameters, causing URL logs to retain the credentials. Authentication and CLI-PHP enablement are required, and an attacker must obtain a stored URL to impersonate the exposed account.

CVSS severity8.8
High
EPSS probability1.51%
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 NetModule Router Software before 4.3.0.113, 4.4.0.111, and 4.5.0.105 allows attackers to take over accounts. The optional CLI-PHP webshell accepts a username and password in URL query parameters, causing URL logs to retain the credentials. Authentication and CLI-PHP enablement are required, and an attacker must obtain a stored URL to impersonate the exposed account.

The record

CVE
CVE-2021-39291
Published
Aug 23, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-532, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 23, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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-532Insertion of Sensitive Information into Log File
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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