CVE-2021-30461

CRITICALNVD 9.89.8—Elevated

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.

CVSS v3: 9.8
EG Score: 9.8(high)
EPSS: 99.8%
KEV: Not listed

Published

May 29, 2021

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://ssd-disclosure.com/ssd-advisory--voipmonitor-unauth-rce
af854a3a-2127-422b-91ae-364da2661108https://ssd-disclosure.com/ssd-advisory--voipmonitor-unauth-rce

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-94Improper Control of Generation of Code (Code Injection)

Data Freshness Timeline

(refreshed 3× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-26 15:51 UTCEG score recompute
2026-05-26 15:51 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-25 09:16 UTCOSV refresh

Publicly available exploits

(3 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoCAl1ex/CVE-2021-30461
First seen May 11, 2021
CVE-2021-30461
Open source ↗
GitHub PoCVulnmachines/CVE-2021-30461
First seen May 7, 2021
VOIP RCE
Open source ↗
Nucleihttp/cves/2021/CVE-2021-30461.yaml
First seen Jan 1, 2021
VoipMonitor <24.61 - Remote Code Execution
Open source ↗

Frequently asked(5)

What is CVE-2021-30461?

CVE-2021-30461 is a critical vulnerability published on May 29, 2021. 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.

When was CVE-2021-30461 disclosed?

CVE-2021-30461 was first published in the National Vulnerability Database on May 29, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-30461 actively exploited?

CVE-2021-30461 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-30461?

CVE-2021-30461 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-30461?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30461, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-30461

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-30461?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)