Skip to content
Fencer Intel
medium 5.9

CVE-2019-9494 json

The implementations of SAE in hostapd and wpa_supplicant are vulnerable to side-channel attacks

published 7y ago modified 4mo ago also EUVD-2019-18868

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.9%
EPSS 3.9% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • synology router_manager 1.2.3-8087
  • wpa Debian 14, Debian 13, Debian 12 2:2.7+git20190128+0c1e29f-4

debian advisories DEBIAN-CVE-2019-9494

  • wpa_supplicant SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4-LTSS +8 more 2.9-15.22.1
  • wpa_supplicant SLES for SAP 12 SP5, SLES 12 SP5 2.9-23.3.1
  • wpa_supplicant SLES for SAP 15, SLES 15-LTSS, SLE Module for Basesystem 15 SP2 +3 more 2.9-4.20.1

suse advisories SUSE-SU-2022:1853-1SUSE-SU-2020:3424-1SUSE-SU-2020:3380-1

  • hostapd openSUSE Tumbleweed 2.9-6.2
  • wpa_supplicant openSUSE Tumbleweed 2.9-13.4
  • wpa_supplicant openSUSE Leap 15.2 2.9-lp152.8.3.1
  • wpa_supplicant openSUSE Leap 15.1 2.9-lp151.5.10.1
  • hostapd Package Hub 15 SP1, Package Hub 15, openSUSE Leap 15.1 2.9-bp151.5.3.1

opensuse advisories openSUSE-SU-2024:10846-1openSUSE-SU-2024:11515-1openSUSE-SU-2020:2059-1openSUSE-SU-2020:2053-1openSUSE-SU-2020:0222-1

  • wpa_supplicant Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 2.7-r2

alpine advisories ALPINE-CVE-2019-9494

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2019-9494 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-9494 updated cvss 7.0

wpa_supplicant: SAE Timing-based and Cache-based side-channel attack against WPA3's Dragonfly handshake

  • Red Hat Enterprise Linux 5 wpa_supplicant Red Hat Enterprise Linux 6 wpa_supplicant Red Hat Enterprise Linux 7 wpa_supplicant Red Hat Enterprise Linux 8 wpa_supplicant Red Hat Virtualization 4 rhvm-appliance, redhat-virtualization-host-image-update
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.88% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Wi-Fi Alliance hostapd with SAE support
  • Wi-Fi Alliance wpa_supplicant with SAE support

Classification

Weakness
  • CWE-208 Observable Timing Discrepancy
  • CWE-524 Use of Cache Containing Sensitive Information
  • CWE-203 Observable Discrepancy

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.