CVE-2021-30461Public exploitNetwork attack vector

Unauthenticated code execution via SPOOLDIR injection

Published May 29, 2021 · Updated Aug 3, 2024

Code injection in the VoIPmonitor web UI before 24.61 allows remote attackers to execute arbitrary code through the recheck option. The recheck handler accepts the user-controlled SPOOLDIR value and writes it into config/configuration.php without neutralizing embedded PHP code. No authentication or user interaction is required when the web UI is network-accessible, and injected PHP runs on the affected server.

CVSS severity9.8
Critical
EPSS probability36.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in the VoIPmonitor web UI before 24.61 allows remote attackers to execute arbitrary code through the recheck option. The recheck handler accepts the user-controlled SPOOLDIR value and writes it into config/configuration.php without neutralizing embedded PHP code. No authentication or user interaction is required when the web UI is network-accessible, and injected PHP runs on the affected server.

The record

CVE
CVE-2021-30461
Published
May 29, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/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 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 exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

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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