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CVE-2021-30502

29
FAUCET Score

CVE-2021-30502 is a critical remote code execution vulnerability affecting versions of the unofficial vscode-ghc-simple (Simple Glasgow Haskell Compiler) extension for Visual Studio Code prior to 0.2.3. An attacker can exploit this by crafting a malicious workspace configuration containing a replCommand. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with no user interaction, leading to complete compromise of confidentiality, integrity, and availability. There is currently no public exploit intelligence, active exploitation, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.2.3CPE matchmatch criteria
cpe:2.3:a:simple_glasgow_haskell_compiler_project:simple_glasgow_haskell_compiler:*:*:*:*:*:visual_studio_code:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.90%
Probability of exploitation in next 30 days
EPSS Percentile
85.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0290 is in the 76th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / dramforever/vscode-ghc-simple/blob/master/CHANGELOG.md
Release NotesThird Party Advisory
github.com / dramforever/vscode-ghc-simple/commit/bc7f6f0b857dade46ea51496d8bd1a4edef39b46
PatchThird Party Advisory
github.com / dramforever/vscode-ghc-simple/releases
Release NotesThird Party Advisory
vuln.ryotak.me / advisories/38
Third Party Advisory