CVE-2021-30461: A remote code execution issue was discovered in the web UI of VoIPmonitor before 24.61

Q: How do I fix CVE-2021-30461?

voipmonitor: upgrade to 24.61. Exact commands for each OS are on this page.

Q: Is CVE-2021-30461 being exploited?

CVE-2021-30461 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-30461 affect?

CVE-2021-30461 affects voipmonitor. Severity is critical (CVSS 9.8). A remote code execution issue was discovered in the web UI of VoIPmonitor before 24.61. When the recheck option is used, the user-supplied SPOOLDIR value (which might contain PHP code) is injected into config/configuration.php.

Q: How urgent is CVE-2021-30461?

Priority 69/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-30461 is a critical-severity flaw (CVSS 9.8) affecting voipmonitor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A remote code execution issue was discovered in the web UI of VoIPmonitor before 24.61. When the recheck option is used, the user-supplied SPOOLDIR value (which might contain PHP code) is injected into config/configuration.php.

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	36.6% (top 2%)
CISA exploited list	No
Weakness	CWE-94
Published	2021-05-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: voipmonitor

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-05-29 14:15 UTCPublished CVE record published
2026-06-17 03:50 UTCUpdated Record last modified

voipmonitor voipmonitor UPGRADE

Affected: < 24.61

Fixed in: 24.61

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy voipmonitor || rpm -q voipmonitor || voipmonitor --version

2. UPGRADE to 24.61 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade voipmonitor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade voipmonitor

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: VoipMonitor <24.61 - Remote Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-30461?

voipmonitor: upgrade to 24.61. Exact commands for each OS are on this page.

Is CVE-2021-30461 being exploited?

CVE-2021-30461 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-30461 affect?

CVE-2021-30461 affects voipmonitor. Severity is critical (CVSS 9.8). A remote code execution issue was discovered in the web UI of VoIPmonitor before 24.61. When the recheck option is used, the user-supplied SPOOLDIR value (which might contain PHP code) is injected into config/configuration.php.

How urgent is CVE-2021-30461?

Priority 69/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2022-24262 HIGH 8.8 UPGRADE The config restore function of Voipmonitor GUI before v24.96 does not properly check files sent as restore arc
CVE-2022-24260 CRITICAL 9.8 UPGRADE A SQL injection vulnerability in Voipmonitor GUI before v24.96 allows attackers to escalate privileges to the
CVE-2022-24259 CRITICAL 9.8 UPGRADE An incorrect check in the component cdr.php of Voipmonitor GUI before v24.96 allows unauthenticated attackers
CVE-2021-41408 CRITICAL 9.8 DOWNGRADE VoIPmonitor WEB GUI up to version 24.61 is affected by SQL injection through the "api.php" file and "user" par

References

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