What is CVE-2021-30004?

CVE-2021-30004 is a medium-severity vulnerability in W1.fi Hostapd, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2021-04-02.

How severe is CVE-2021-30004?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Improper input validation in W1.fi Hostapd

CVE-2021-30004

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

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-04-02 · last modified 2026-07-07.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.5th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.001

Affected products

W1.fi Hostapd — versions 2.9
W1.fi Wpa Supplicant — versions 2.9

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

w1.fi/cgit/hostap/commit/ (Patch, Vendor Advisory)
security.gentoo.org/glsa/202309-16 (vendor-advisory)

Frequently asked questions

What is CVE-2021-30004?: CVE-2021-30004 is a medium-severity vulnerability in W1.fi Hostapd, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2021-04-02.
How severe is CVE-2021-30004?: Medium severity. CVSS v3 base score is 5.3 out of 10.