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Vulnerability record · CVE-2021-30004 · published 2 April 2021

CVE-2021-30004: W1.fi hostapd improper input validation vulnerability

WW1.Fi · Hostapd

In wpa_supplicant and hostapd 2.9, forging attacks may occur because AlgorithmIdentifier parameters are mishandled in tls/pkcs1.c and tls/x509v3.c.

5.3 CVSS 3.1 Medium EPSS 1.8% · top 22.4% CWE-20 · Improper input validation
5.3CVSS 3.1 base score, v2 5.0
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
7 Jul 2026Last modified by NVD

Description

In wpa_supplicant and hostapd 2.9, forging attacks may occur because AlgorithmIdentifier parameters are mishandled in tls/pkcs1.c and tls/x509v3.c.

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

Affected products

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

References

LinkTags
https://security.gentoo.org/glsa/202309-16
https://w1.fi/cgit/hostap/commit/?id=a0541334a6394f8237a4393b7372693cd7e96f15 PatchVendor Advisory
https://security.gentoo.org/glsa/202309-16
https://w1.fi/cgit/hostap/commit/?id=a0541334a6394f8237a4393b7372693cd7e96f15 PatchVendor Advisory

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2021-30004), CISA KEV, FIRST EPSS (scores of 2026-10-10). This page is refreshed as NVD updates the record.