CVE-2019-11555

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.

Published: 2019-04-26 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-11555 is rated Moderate Risk (51.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 9.38%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-11555

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-22 13.71% 9.38% -4.33%
2 2026-03-27 13.90% 13.71% -0.19%
3 2026-02-18 — 13.90% —

Full EPSS history (22 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-11555

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.0 MEDIUM
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2019-11555

OS Trackers for CVE-2019-11555

vendor priority summary link
alpine medium CVE-2019-11555: 2 source package rows (hostapd, wpa_supplicant); 40 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 20, open 20. https://security.alpinelinux.org/vuln/CVE-2019-11555
debian not yet assigned CVE-2019-11555 not yet assigned priority: Debian including 1 source packages (wpa), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-11555
gentoo normal CVE-2019-11555: 1 GLSA(s) (201908-25), 2 atom(s) (net-wireless/hostapd, net-wireless/wpa_supplicant); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-11555
redhat medium — https://access.redhat.com/security/cve/CVE-2019-11555
suse medium CVE-2019-11555 severity moderate: SUSE including 22 source package names (latest:wpa_supplicant-2.9-4.20.1, wpa_supplicant, …), 83 product×package rows across 80 product lines (Container rancher/elemental-teal-rt/5.3, Container rancher/elemental-teal-rt/5.4, … (80 product lines)): Fixed 68, Known Not Affected 15. https://www.suse.com/security/cve/CVE-2019-11555/
ubuntu medium CVE-2019-11555 medium priority: Ubuntu including 1 source packages (wpa), 6 status rows across 6 suites (bionic, cosmic, disco, trusty, upstream, xenial): released 6. https://ubuntu.com/security/CVE-2019-11555

Affected software / configurations for CVE-2019-11555

Vendor Product Version Raw CPE
w1.fi hostapd < 2.8 cpe:2.3:a:w1.fi:hostapd:*:*:*:*:*:*:*:*
w1.fi wpa_supplicant < 2.8 cpe:2.3:a:w1.fi:wpa_supplicant:*:*:*:*:*:*:*:*

References for CVE-2019-11555

URL Tags
http://www.openwall.com/lists/oss-security/2019/04/26/1 Mailing List Patch Third 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/5T7G763UECWR7FQXOJVL67PW7C5A3SA4/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJKZHAT5KPUN26JL77EUH563GAH5XZ5C/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IQ6P2GI5GSXRNLNIUNPARFZQVDEIGVZD/
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/ Patch Vendor 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 List Patch Third Party Advisory
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