CVE-2019-9495

Publication date 10 April 2019

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
wpa	19.04 disco	Fixed 2:2.6-21ubuntu3
	18.10 cosmic	Fixed 2:2.6-18ubuntu1.1
	18.04 LTS bionic	Fixed 2:2.6-15ubuntu2.2
	16.04 LTS xenial	Fixed 2.4-0ubuntu6.4
	14.04 LTS trusty	Fixed 2.1-0ubuntu1.7
wpasupplicant	19.04 disco	Not in release
	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Severity score breakdown

Parameter	Value
Base score	3.7 · Low
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-3944-1
wpa_supplicant and hostapd vulnerabilities
10 April 2019