How severe is CVE-2021-30124?

CVE-2021-30124 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-30124 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30124?

CVE-2021-30124 affects Vscode-phpmd Project Vscode-phpmd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30124?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-30124 published?

CVE-2021-30124 was published on 2021-07-30 and last updated on 2026-06-17.

CVE-2021-30124

CVE-2021-30124 is a critical-severity vulnerability in Vscode-phpmd Project Vscode-phpmd with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Vscode-phpmd Project Vscode-phpmd
Published: 2021-07-30
Last modified: 2026-06-17

Description

The unofficial vscode-phpmd (aka PHP Mess Detector) extension before 1.3.0 for Visual Studio Code allows remote attackers to execute arbitrary code via a crafted phpmd.command value in a workspace folder.

Frequently asked questions

What is CVE-2021-30124?: The unofficial vscode-phpmd (aka PHP Mess Detector) extension before 1.3.0 for Visual Studio Code allows remote attackers to execute arbitrary code via a crafted phpmd.command value in a workspace folder.
How severe is CVE-2021-30124?: CVE-2021-30124 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-30124 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30124?: CVE-2021-30124 affects Vscode-phpmd Project Vscode-phpmd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30124?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-30124 published?: CVE-2021-30124 was published on 2021-07-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:vscode-phpmd_project:vscode-phpmd:*:*:*:*:*:visual_studio_code:*:*