CVE-2021-30004: w1.fi hostapd Improper Input Validation
CVSS: 5.3v3.1MediumModified
AliasesALPINE-CVE-2021-30004MGASA-2021-0254SUSE-SU-2021:1125-1SUSE-SU-2021:1166-1DEBIAN-CVE-2021-30004openSUSE-SU-2021:0563-1
Published 02-04-2021Last modified 07-07-2026
Vulnerability summary
CVE-2021-30004 is a medium (CVSS 5.3) Improper Input Validation vulnerability in w1.fi hostapd. EPSS estimates a 1.64% chance of exploitation in the next 30 days, higher than 75.9% of scored vulnerabilities.
CVSS score
5.3/10
010
Medium · v3.1 (NVD)EPSS score
1.64%
0%100%
Low · -0.05 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 4 · Related 4Timeline
- 02-04-2021PublishedVulnerability first disclosed.
- 07-07-2026Last modifiedVulnerability information updated.
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 metrics
5 scores · 4 sources · 2 versionsMedium 5.3Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NSources4 sources · 4.3–5.3
- CVE.orgCNA4.3MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NDiffers
- OSV · AlpineEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
1.64%
Chance of exploitation in the next 30 days
Percentile
76%
Versus all other CVEs
30-day change
-0.05 pp
From 1.68% on 19-09-2026
19-09-202619-10-2026
EPSS score1.64%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Mageia4 products
- hostapd< 2.9-1.3.mga7
- wpa_supplicant< 2.9-1.5.mga7
- hostapd< 2.9-5.1.mga8
- wpa_supplicant< 2.9-8.2.mga8
Suse4 products
- wpa_supplicant&distro=SUSE Linux Enterprise Micro 5.0< 2.9-4.29.1
- wpa_supplicant&distro=SUSE Linux Enterprise Module for Basesystem 15 SP2< 2.9-4.29.1
- wpa_supplicant&distro=SUSE Linux Enterprise Server 12 SP5< 2.9-23.12.1
- wpa_supplicant&distro=SUSE Linux Enterprise Server for SAP Applications 12 SP5< 2.9-23.12.1
Alpine2 products
- hostapd< 2.9-r3
- wpa_supplicant< 2.9-r8 | < 2.9-r11 | < 2.9-r13
W1.fi2 products
- hostapd2.9
- wpa_supplicant2.9
Debian1 product
- wpa< 2:2.10-1
Opensuse1 product
- wpa_supplicant&distro=openSUSE Leap 15.2< 2.9-lp152.8.12.1
6 vendors · 14 products
References
13 links- security.gentoo.org/glsa/202309-16Vendor Advisory
