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Exploitation reportedNot in CISA KEV yetFix available

CVE-2021-30461

Exploitation reported by one source. First attested on 2024-09-06 by GCVE · shadowserver.

  • Published2021-05-29
  • Fixed in24.61
  • WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-05-2914:15CVE publishedNVD
  2. 2024-09-0617:06Listed as exploited by GCVEGCVE
  3. 2024-09-0617:06Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-30461?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-30461?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Voipmonitor
BranchAffectedFixed in
24.61< 24.6124.61

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Voipmonitor to 24.61

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
4 repositories, unverifieddaedalus/CVE-2021-30461Vulnmachines/CVE-2021-30461Al1ex/CVE-2021-30461puckiestyle/CVE-2021-30461
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-05-29
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-30461?

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.

Is CVE-2021-30461 actively exploited?

Active exploitation of CVE-2021-30461 has not been confirmed. Its EPSS score was 36.6% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

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

CVE-2021-30461 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record