CVE-2021-30502

The unofficial vscode-ghc-simple (aka Simple Glasgow Haskell Compiler) extension before 0.2.3 for...

9.8 Critical

The unofficial vscode-ghc-simple (aka Simple Glasgow Haskell Compiler) extension before 0.2.3 for Visual Studio Code allows remote code execution via a crafted workspace configuration with replCommand.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.90%Up 0.6 points since Apr 27, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2021-30502
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-30502
Updated: 2026-11-02

EUVDEUVD-2021-17423 No score

Record: EUVD-2021-17423
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mgm6-c25g-557g No score

The unofficial vscode-ghc-simple (aka Simple Glasgow Haskell Compiler) extension before 0.2.3 for...

Record: GHSA-mgm6-c25g-557g
Updated: 2026-11-02

OSV 9.8

Record: CVE-2021-30502
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

simple glasgow haskell compiler project glasgow haskell compiler

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-30502 is a critical vulnerability (CVSS 9.8) in Simple Glasgow Haskell Compiler Project Glasgow Haskell Compiler, published April 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.90%, the 87th percentile. No source names a fixed version.