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Vulnerability record · CVE-2019-11555 · published 26 April 2019

CVE-2019-11555: W1.fi hostapd null pointer dereference vulnerability

WW1.Fi · Hostapd

The EAP-pwd implementation in hostapd (EAP server) before 2.8 and wpa_supplicant (EAP peer) before 2.8 does not validate fragmentation reassembly state properly for a case where an unexpected fragment could be received. This could result in process termination due to a NULL pointer dereference (denial of service). This affects eap_server/eap_server_pwd.c and eap_peer/eap_pwd.c.

5.9 CVSS 3.0 Medium EPSS 3.3% · top 12.0% CWE-476 · NULL pointer dereference
5.9CVSS 3.0 base score, v2 4.3
3.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
30References
17 Jun 2026Last modified by NVD

Description

The EAP-pwd implementation in hostapd (EAP server) before 2.8 and wpa_supplicant (EAP peer) before 2.8 does not validate fragmentation reassembly state properly for a case where an unexpected fragment could be received. This could result in process termination due to a NULL pointer dereference (denial of service). This affects eap_server/eap_server_pwd.c and eap_peer/eap_pwd.c.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2019/04/26/1 Mailing ListPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/07/msg00030.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5T7G763UECWR7FQXOJVL67P
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJKZHAT5KPUN26JL77EUH56
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IQ6P2GI5GSXRNLNIUNPARFZ
https://seclists.org/bugtraq/2019/May/40
https://seclists.org/bugtraq/2019/May/64
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:03.wpa.asc
https://security.gentoo.org/glsa/201908-25
https://usn.ubuntu.com/3969-1/
https://usn.ubuntu.com/3969-2/
https://w1.fi/security/2019-5/ PatchVendor Advisory
https://w1.fi/security/2019-5/eap-pwd-message-reassembly-issue-with-unexpected-fragment.txt Vendor Advisory
https://www.debian.org/security/2019/dsa-4450
https://www.openwall.com/lists/oss-security/2019/04/18/6 Mailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2019/04/26/1 Mailing ListPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/07/msg00030.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5T7G763UECWR7FQXOJVL67P
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJKZHAT5KPUN26JL77EUH56
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IQ6P2GI5GSXRNLNIUNPARFZ
https://seclists.org/bugtraq/2019/May/40
https://seclists.org/bugtraq/2019/May/64
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:03.wpa.asc
https://security.gentoo.org/glsa/201908-25
https://usn.ubuntu.com/3969-1/
https://usn.ubuntu.com/3969-2/
https://w1.fi/security/2019-5/ PatchVendor Advisory
https://w1.fi/security/2019-5/eap-pwd-message-reassembly-issue-with-unexpected-fragment.txt Vendor Advisory
https://www.debian.org/security/2019/dsa-4450
https://www.openwall.com/lists/oss-security/2019/04/18/6 Mailing ListPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-11555), CISA KEV, FIRST EPSS (scores of 2026-10-08). This page is refreshed as NVD updates the record.