CVE-2021-41167

Unlimited requests in modern-async

HIGH
7.5
CVSS Score
Published: October 20, 2021 at 06:25 PM UTC
Updated: June 17, 2026 at 04:08 AM UTC
2 products affected across 2 vendorsModern AsyncAsync Project Modern Async

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

modern-async is an open source JavaScript tooling library for asynchronous operations using async/await and promises. In affected versions a bug affecting two of the functions in this library: forEachSeries and forEachLimit. They should limit the concurrency of some actions but, in practice, they don't. Any code calling these functions will be written thinking they would limit the concurrency but they won't. This could lead to potential security issues in other projects. The problem has been patched in 1.0.4. There is no workaround.

Affected

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

v < 1.0.4
Affected range stops below 1.0.4, so it looks safe — our inference, not a vendor statement
v < 1.0.4
Affected range stops below 1.0.4, 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:

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400CWE-770

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