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Vulnerability record · CVE-2021-22918 · published 12 July 2021

CVE-2021-22918: Nodejs node.js out-of-bounds read vulnerability

Nodejs · Node.Js

Node.js before 16.4.1, 14.17.2, 12.22.2 is vulnerable to an out-of-bounds read when uv__idna_toascii() is used to convert strings to ASCII. The pointer p is read and increased without checking whether it is beyond pe, with the latter holding a pointer to the end of the buffer. This can lead to information disclosures or crashes. This function can be triggered via uv_getaddrinfo().

5.3 CVSS 3.1 Medium EPSS 23% · top 2.3% CWE-125 · Out-of-bounds read
5.3CVSS 3.1 base score, v2 5.0
23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Node.js before 16.4.1, 14.17.2, 12.22.2 is vulnerable to an out-of-bounds read when uv__idna_toascii() is used to convert strings to ASCII. The pointer p is read and increased without checking whether it is beyond pe, with the latter holding a pointer to the end of the buffer. This can lead to information disclosures or crashes. This function can be triggered via uv_getaddrinfo().

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf PatchThird Party Advisory
https://hackerone.com/reports/1209681 ExploitThird Party Advisory
https://nodejs.org/en/blog/vulnerability/july-2021-security-releases/ PatchVendor Advisory
https://security.gentoo.org/glsa/202401-23
https://security.netapp.com/advisory/ntap-20210805-0003/ Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf PatchThird Party Advisory
https://hackerone.com/reports/1209681 ExploitThird Party Advisory
https://nodejs.org/en/blog/vulnerability/july-2021-security-releases/ PatchVendor Advisory
https://security.gentoo.org/glsa/202401-23
https://security.netapp.com/advisory/ntap-20210805-0003/ Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-22918), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.