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Vulnerability record · CVE-2019-9495 · published 17 April 2019

CVE-2019-9495: W1.fi hostapd observable discrepancy vulnerability

WW1.Fi · Hostapd

The implementations of EAP-PWD in hostapd and wpa_supplicant are vulnerable to side-channel attacks as a result of cache access patterns. All versions of hostapd and wpa_supplicant with EAP-PWD support are vulnerable. The ability to install and execute applications is necessary for a successful attack. Memory access patterns are visible in a shared cache. Weak passwords may be cracked. Versions of hostapd/wpa_supplicant 2.7 and newer, are not vulnerable to the timing attack described in CVE-2019-9494. Both hostapd with EAP-pwd support and wpa_supplicant with EAP-pwd support prior to and including version 2.7 are affected.

3.7 CVSS 3.1 Low EPSS 3.5% · top 11.2% CWE-524 · CWE-524CWE-203 · Observable discrepancy
3.7CVSS 3.1 base score, v2 4.3
3.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

Description

The implementations of EAP-PWD in hostapd and wpa_supplicant are vulnerable to side-channel attacks as a result of cache access patterns. All versions of hostapd and wpa_supplicant with EAP-PWD support are vulnerable. The ability to install and execute applications is necessary for a successful attack. Memory access patterns are visible in a shared cache. Weak passwords may be cracked. Versions of hostapd/wpa_supplicant 2.7 and newer, are not vulnerable to the timing attack described in CVE-2019-9494. Both hostapd with EAP-pwd support and wpa_supplicant with EAP-pwd support prior to and including version 2.7 are affected.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00021.html Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/152914/FreeBSD-Security-Advisory-FreeBSD-SA-19-03.wpa.html Third Party AdvisoryVDB Entry
https://lists.debian.org/debian-lts-announce/2019/07/msg00030.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/56OBBOJJSKRTDGEXZOVFSTP
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVMJOFEYBGXZLFF5IOLW67S
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TDOZGR3T7FVO5JSZWK2QPR7
https://seclists.org/bugtraq/2019/May/40 Mailing ListThird Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:03.wpa.asc Third Party Advisory
https://w1.fi/security/2019-2/ PatchVendor Advisory
https://www.synology.com/security/advisory/Synology_SA_19_16 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00021.html Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/152914/FreeBSD-Security-Advisory-FreeBSD-SA-19-03.wpa.html Third Party AdvisoryVDB Entry
https://lists.debian.org/debian-lts-announce/2019/07/msg00030.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/56OBBOJJSKRTDGEXZOVFSTP
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVMJOFEYBGXZLFF5IOLW67S
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TDOZGR3T7FVO5JSZWK2QPR7
https://seclists.org/bugtraq/2019/May/40 Mailing ListThird Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:03.wpa.asc Third Party Advisory
https://w1.fi/security/2019-2/ PatchVendor Advisory
https://www.synology.com/security/advisory/Synology_SA_19_16 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-9495), CISA KEV, FIRST EPSS (scores of 2026-10-09). This page is refreshed as NVD updates the record.