How severe is CVE-2021-30503?

CVE-2021-30503 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-2021-30503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30503?

CVE-2021-30503 affects Glsl Linting Project Glsl Linting. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30503?

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-2021-30503 published?

CVE-2021-30503 was published on 2021-04-13 and last updated on 2026-06-17.

CVE-2021-30503

CVE-2021-30503 is a critical-severity vulnerability in Glsl Linting Project Glsl Linting 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% (85th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Glsl Linting Project Glsl Linting
Published: 2021-04-13
Last modified: 2026-06-17

Description

The unofficial GLSL Linting extension before 1.4.0 for Visual Studio Code allows remote code execution via a crafted glslangValidatorPath in the workspace configuration.

Frequently asked questions

What is CVE-2021-30503?: The unofficial GLSL Linting extension before 1.4.0 for Visual Studio Code allows remote code execution via a crafted glslangValidatorPath in the workspace configuration.
How severe is CVE-2021-30503?: CVE-2021-30503 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-2021-30503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30503?: CVE-2021-30503 affects Glsl Linting Project Glsl Linting. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30503?: 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-2021-30503 published?: CVE-2021-30503 was published on 2021-04-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:glsl_linting_project:glsl_linting:*:*:*:*:*:visual_studio_code:*:*