CVE intelligence and bounded remediation

CVE-2019-9496 — W1.Fi Hostapd security vulnerability

High CVSS 7.5

An invalid authentication sequence could result in the hostapd process terminating due to missing state validation steps when processing the SAE confirm message when in hostapd/AP mode. All version of hostapd with SAE support are vulnerable. An attacker may force the hostapd process to terminate, performing a denial of service attack. Both hostapd with SAE support and wpa_supplicant with SAE support prior to and including version 2.7 are affected.

Severity
High
CVSS
7.5 (3.0)
Published
2019-04-17
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-642, CWE-287

Affected products

  • w1.fi / hostapd
  • w1.fi / wpa_supplicant
  • fedoraproject / fedora / 28
  • fedoraproject / fedora / 29
  • fedoraproject / fedora / 30

Matched remediation archetype

Authentication bypass and missing authentication

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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