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CVE-2021-21372

Nimble arbitrary code execution for specially crafted package metadata

HIGH
8.8
CVSS Score
Published: March 26, 2021 at 09:20 PM UTC
Updated: June 17, 2026 at 03:35 AM UTC
2 products affected across 1 vendorNimLang Nim

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Severity
HIGH8.8
Exploit prediction
EPSS 4%

Description

Nimble is a package manager for the Nim programming language. In Nim release version before versions 1.2.10 and 1.4.4, Nimble doCmd is used in different places and can be leveraged to execute arbitrary commands. An attacker can craft a malicious entry in the packages.json package list to trigger code execution.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nim· Nim Lang
95%
v < 1.2.101.4.0 ≤ v < 1.4.4
Affected range stops below 1.2.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.4.4, so it looks safe — our inference, not a vendor statement
Lang Nim· Nim Lang
60%
v < 1.2.10v < 1.4.4
Affected range stops below 1.2.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.4.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/nim-lang/nimble/commit/7bd63d504a4157b8ed61a51af47fb086ee818c37
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/nim-lang/security/security/advisories/GHSA-rg9f-w24h-962p

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20CWE-74CWE-78

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