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Fencer Vulns
medium 5.9

CVE-2019-11555 json

The EAP-pwd implementation in hostapd (EAP server) before 2.8 and wpa_supplicant (EAP peer) before 2.8 does not validate fragmentation reas…

published 2019-04-26 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3226

cvss
5.9
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

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.

Patch / fix

  • w1.fi hostapd 2.8
  • w1.fi wpa_supplicant 2.8
  • wpa Debian 14, Debian 13, Debian 12 2:2.7+git20190128+0c1e29f-5

debian advisories DEBIAN-CVE-2019-11555

  • wpa Ubuntu 16.04 LTS 2.4-0ubuntu6.5
  • wpa Ubuntu 18.04 LTS 2:2.6-15ubuntu2.3
  • wpa Ubuntu Pro 14.04 LTS 2.1-0ubuntu1.7+esm1

ubuntu advisories UBUNTU-CVE-2019-11555

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • 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

  • 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

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

  • hostapd Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 2.8-r0
  • hostapd Alpine 3.7 2.6-r4
  • hostapd Alpine 3.8 2.6-r5
  • hostapd Alpine 3.9 2.7-r1
  • wpa_supplicant Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 2.7-r3
  • wpa_supplicant Alpine 3.7 2.6-r10
  • wpa_supplicant Alpine 3.8 2.6-r15

alpine advisories ALPINE-CVE-2019-11555

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

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-2019-11555 updated cvss 5.3

wpa_supplicant: NULL pointer dereference due to improper fragmentation reassembly state validation in EAP-pwd implementation

  • 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
    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

3.25% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns 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.