CVE-2021-22884Public exploitNetwork attack vector

Remote code execution via localhost6 inspector allowlist

Published Mar 3, 2021 · Updated Apr 30, 2025

DNS rebinding in the Node.js inspector before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 allows remote attackers to execute code. HttpHandler::IsAllowedHost in src/inspector_socket.cc accepts localhost6 even when that name resolves through attacker-controlled DNS. Exploitation requires an active inspector and a malicious website opened on a machine that can reach it; successful access grants full code execution in the Node.js process.

CVSS severity7.5
High
EPSS probability32.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DNS rebinding in the Node.js inspector before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 allows remote attackers to execute code. HttpHandler::IsAllowedHost in src/inspector_socket.cc accepts localhost6 even when that name resolves through attacker-controlled DNS. Exploitation requires an active inspector and a malicious website opened on a machine that can reach it; successful access grants full code execution in the Node.js process.

The record

CVE
CVE-2021-22884
Published
Mar 3, 2021
Updated
Apr 30, 2025
Vendor
Node.js
Product
Node.js
Classifications
CWE-350, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 3, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0 <10.24.0
  2. Affected versionversion=11.0 <11.*
  3. Affected versionversion=12.0 <12.21.0
  4. Affected versionversion=13.0 <13.*
  5. Affected versionversion=14.0 <14.16.0
  6. Affected versionversion=15.0 <15.10.0
  7. Affected versionversion=4.0 <4.*
  8. Affected versionversion=5.0 <5.*
  9. Affected versionversion=6.0 <6.*
  10. Affected versionversion=7.0 <7.*
  11. Affected versionversion=8.0 <8.*
  12. Affected versionversion=9.0 <9.*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Node.js · Node.jsversion=10.0 <10.24.0; version=11.0 <11.*; version=12.0 <12.21.0; version=13.0 <13.*; version=14.0 <14.16.0; version=15.0 <15.10.0; version=4.0 <4.*; version=5.0 <5.*; version=6.0 <6.*; version=7.0 <7.*; version=8.0 <8.*; version=9.0 <9.*

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
5.1NIST NVDAV:N/AC:H/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-350Reliance on Reverse DNS Resolution for a Security-Critical Action
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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