Advisory Published

USN-4734-1: wpa_supplicant and hostapd vulnerabilities

First published: Thu Feb 11 2021(Updated: )

It was discovered that wpa_supplicant did not properly handle P2P (Wi-Fi Direct) group information in some situations, leading to a heap overflow. A physically proximate attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2021-0326) It was discovered that hostapd did not properly handle UPnP subscribe messages in some circumstances. An attacker could use this to cause a denial of service. (CVE-2020-12695)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/hostapd<2:2.9-1ubuntu8.1
2:2.9-1ubuntu8.1
=20.10
All of
ubuntu/wpasupplicant<2:2.9-1ubuntu8.1
2:2.9-1ubuntu8.1
=20.10
All of
ubuntu/hostapd<2:2.9-1ubuntu4.2
2:2.9-1ubuntu4.2
=20.04
All of
ubuntu/wpasupplicant<2:2.9-1ubuntu4.2
2:2.9-1ubuntu4.2
=20.04
All of
ubuntu/hostapd<2:2.6-15ubuntu2.7
2:2.6-15ubuntu2.7
=18.04
All of
ubuntu/wpasupplicant<2:2.6-15ubuntu2.7
2:2.6-15ubuntu2.7
=18.04
All of
ubuntu/hostapd<1:2.4-0ubuntu6.7
1:2.4-0ubuntu6.7
=16.04
All of
ubuntu/wpasupplicant<2.4-0ubuntu6.7
2.4-0ubuntu6.7
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this advisory?

    The vulnerability ID for this advisory is USN-4734-1.

  • What software is affected by this vulnerability?

    The wpa_supplicant and hostapd software is affected by this vulnerability.

  • What is the severity of CVE-2021-0326?

    The severity of CVE-2021-0326 is not mentioned in the advisory, but it can lead to a denial of service or possible arbitrary code execution.

  • How do I fix the vulnerability in hostapd package version 2:2.9-1ubuntu8.1?

    To fix the vulnerability in hostapd package version 2:2.9-1ubuntu8.1, update it to version 2:2.9-1ubuntu8.1 by applying the provided remedy.

  • How do I fix the vulnerability in wpasupplicant package version 2:2.9-1ubuntu8.1?

    To fix the vulnerability in wpasupplicant package version 2:2.9-1ubuntu8.1, update it to version 2:2.9-1ubuntu8.1 by applying the provided remedy.

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