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CVE-2021-30004

21
FAUCET Score

CVE-2021-30004 is a medium-severity vulnerability affecting wpa_supplicant and hostapd versions 2.9, allowing for forging attacks due to mishandled AlgorithmIdentifier parameters in their TLS/PKCS1 and X.509v3 implementations. This network-exploitable flaw has a low attack complexity and could lead to a loss of integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.9CPE matchmatch criteria
cpe:2.3:a:w1.fi:hostapd:2.9:*:*:*:*:*:*:*
2.9CPE matchmatch criteria
cpe:2.3:a:w1.fi:wpa_supplicant:2.9:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.67%
Probability of exploitation in next 30 days
EPSS Percentile
74.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0167 is in the 59th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

microsoftpatch availablevia msrc
Product: 19067-16820Fixed in: 2.9-4
microsoftpatch availablevia msrc
Product: 17020-16823Fixed in: 2.9-4
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 2.9-4
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 2.9-4
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 2.9-4
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 2.9-4
microsoftpatch availablevia msrc
Product: cm1 wpa_supplicant 2.9-4 on CBL Mariner 1.0Fixed in: 2.9-4
microsoftpatch availablevia msrc
Product: cbl2 wpa_supplicant 2.9-4 on CBL Mariner 2.0Fixed in: 2.9-4

Vendor Advisories (3)

microsoft2023-Mar/CVE-2021-30004

CVE-2021-30004

Mar 14, 2023
microsoft2021-Apr/CVE-2021-30004Moderate

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

Apr 13, 2021
redhatCVE-2021-30004Moderate

wpa_supplicant: mishandled AlgorithmIdentifier parameters may lead to forging attacks

Mar 14, 2021

References

security.gentoo.org / glsa/202309-16
w1.fi / cgit/hostap/commit
PatchVendor Advisory