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.

Published: 2021-04-02 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-30004 is rated Low Risk (39.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.30%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-30004

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.24% 0.30% +0.06%
2 2025-11-18 0.27% 0.24% -0.02%
3 2025-03-30 — 0.27% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-30004

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-30004

OS Trackers for CVE-2021-30004

vendor priority summary link
alpine medium CVE-2021-30004: 2 source package rows (hostapd, wpa_supplicant); 51 state rows across 9 repos (3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 41, open 10. https://security.alpinelinux.org/vuln/CVE-2021-30004
debian unimportant CVE-2021-30004 unimportant priority: Debian including 1 source packages (wpa), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2021-30004
gentoo normal CVE-2021-30004: 1 GLSA(s) (202309-16), 2 atom(s) (net-wireless/hostapd, net-wireless/wpa_supplicant); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-30004
redhat medium — https://access.redhat.com/security/cve/CVE-2021-30004
suse medium CVE-2021-30004 severity moderate: SUSE including 21 source package names (hostapd-2.9-6.2, hostapd-2.9-bp152.2.3.1, …), 55 product×package rows across 51 product lines (Container rancher/elemental-teal-rt/5.3, Container rancher/elemental-teal-rt/5.4, … (51 product lines)): Fixed 51, Known Not Affected 4. https://www.suse.com/security/cve/CVE-2021-30004/
ubuntu medium CVE-2021-30004 medium priority: Ubuntu including 1 source packages (wpa), 6 status rows across 6 suites (bionic, focal, groovy, trusty, upstream, xenial): not-affected 5, needs-triage 1. https://ubuntu.com/security/CVE-2021-30004

Affected software / configurations for CVE-2021-30004

Vendor Product Version Raw CPE
w1.fi hostapd 2.9 cpe:2.3:a:w1.fi:hostapd:2.9:*:*:*:*:*:*:*
w1.fi wpa_supplicant 2.9 cpe:2.3:a:w1.fi:wpa_supplicant:2.9:*:*:*:*:*:*:*

References for CVE-2021-30004

cvelogic Threat Intelligence