CVE-2019-9494
wpa_supplicant: SAE Timing-based and Cache-based side-channel attack against WPA3's Dragonfly handshake
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · April 10, 2019
Updated · November 21, 2025
Description
The implementations of SAE in hostapd and wpa_supplicant are vulnerable to side channel attacks as a result of observable timing differences and cache access patterns. An attacker may be able to gain leaked information from a side channel attack that can be used for full password recovery. Both hostapd with SAE support and wpa_supplicant with SAE support prior to and including version 2.7 are affected.
Statement
This issue did not affect the versions of wpa_supplicant as shipped with Red Hat Enterprise Linux 5, 6 as they did not include support for SAE (Simultaneous Authentication of Equals).
This issue did not affect the versions of wpa_supplicant as shipped with Red Hat Enterprise Linux 7 as they are not compiled with SAE (Simultaneous Authentication of Equals) enabled. In particular, the CONFIG_SAE=y option is not set at compile time.
An attacker must be able to run unprivileged code on the victim's machine to be able to exploit it, lowering the severity of this flaw to Moderate.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 7CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-385 · Covert Timing Channel