CVE-2019-11555: w1.fi hostapd NULL Pointer Dereference
Vulnerability summary
CVE-2019-11555 is a medium (CVSS 5.9) NULL Pointer Dereference vulnerability in w1.fi hostapd. EPSS estimates a 3.25% chance of exploitation in the next 30 days, higher than 88.3% of scored vulnerabilities.
Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Related 6Timeline
- 26-04-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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 metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
3.25%
Chance of exploitation in the next 30 days
Percentile
88%
Versus all other CVEs
30-day change
No change 0.00 pp
From 3.25% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine2 products
- hostapd< 2.8-r0 | < 2.6-r4 | < 2.6-r5 | < 2.7-r1
- wpa_supplicant< 2.7-r3 | < 2.6-r10 | < 2.6-r15
W1.fi2 products
- hostapd< 2.8
- wpa_supplicant< 2.8
Debian1 product
- wpa< 2:2.7+git20190128+0c1e29f-5 | < 2:2.4-1+deb9u4
Ubuntu1 product
- wpa< 2.4-0ubuntu6.5 | < 2:2.6-15ubuntu2.3 | < 2.1-0ubuntu1.7+esm1
4 vendors · 6 products
References
21 links- www.openwall.com/lists/oss-security/2019/04/18/6X Refsource MISCMailing ListPatchThird Party AdvisoryREPORT
- w1.fi/security/2019-5/eap-pwd-message-reassembly-issue-with-unexpected-fragment.txtX Refsource MISCVendor AdvisoryREPORT
- www.openwall.com/lists/oss-security/2019/04/26/1Mailing ListX Refsource MLISTPatchThird Party AdvisoryREPORT
