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NVD / CVE Program· CNA mitre

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 reass

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.2% (FIRST EPSS); higher than 88.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: hostapd (Alpine:v3.10) 2.8-r0; wpa_supplicant (Alpine:v3.10) 2.7-r3; hostapd (Alpine:v3.7) 2.6-r4.

Low priority for now. Upgrade to hostapd (Alpine:v3.10) 2.8-r0; wpa_supplicant (Alpine:v3.10) 2.7-r3; hostapd (Alpine:v3.7) 2.6-r4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.9 · v3.0—No exploit Fix available
Published
Apr 26, 2019
Updated
Jun 16, 2026
EPSS
3.2% · 88th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2019-11555

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
w1.fihostapd
w1.fiwpa supplicant

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • w1.fi hostapdbefore 2.8
  • w1.fi wpa supplicantbefore 2.8

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10hostapdbefore 2.8-r02.8-r0
Alpine:v3.10wpa_supplicantbefore 2.7-r32.7-r3
Alpine:v3.7hostapdbefore 2.6-r42.6-r4
Alpine:v3.7wpa_supplicantbefore 2.6-r102.6-r10
Alpine:v3.8hostapdbefore 2.6-r52.6-r5
Alpine:v3.8wpa_supplicantbefore 2.6-r152.6-r15
Alpine:v3.9hostapdbefore 2.7-r12.7-r1
Debian:12wpabefore 2:2.7+git20190128+0c1e29f-52:2.7+git20190128+0c1e29f-5
Debian:8wpabefore 2.3-1+deb8u82.3-1+deb8u8
Debian:9wpabefore 2:2.4-1+deb9u42:2.4-1+deb9u4
openSUSE:Leap 15.1wpa_supplicantbefore 2.9-lp151.5.10.12.9-lp151.5.10.1
openSUSE:Leap 15.2wpa_supplicantbefore 2.9-lp152.8.3.12.9-lp152.8.3.1
openSUSE:Tumbleweedwpa_supplicantbefore 2.9-13.42.9-13.4
SUSE:HPE Helion OpenStack 8wpa_supplicantbefore 2.9-15.22.12.9-15.22.1
SUSE:Linux Enterprise Module for Basesystem 15 SP1wpa_supplicantbefore 2.9-4.20.12.9-4.20.1
SUSE:Linux Enterprise Server 12 SP5wpa_supplicantbefore 2.9-23.3.12.9-23.3.1

Same product

w1.fi: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-23304The implementations of EAP-pwd in hostapd before 2.10 and wpa_supplicant before 2.10 are vulnerable to side-channel attacks as a result of c
    40Plan
  • CVE-2022-23303The implementations of SAE in hostapd before 2.10 and wpa_supplicant before 2.10 are vulnerable to side channel attacks as a result of cache
    40Plan
  • CVE-2019-9499The implementations of EAP-PWD in wpa_supplicant EAP Peer do not validate the scalar and element values in EAP-pwd-Commit
    33Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2019-9497Apr 17, 2019 · The implementations of EAP-PWD in hostapd EAP Server and wpa_supplicant EAP Peer do not validate the scalar and element values in EAP-pwd-Commit
    33Monitor
  • ← EarlierCVE-2019-9498Apr 17, 2019 · The implementations of EAP-PWD in hostapd EAP Server do not validate the scalar and element values in EAP-pwd-Commit
    33Monitor
  • Later →CVE-2019-13377Aug 15, 2019 · The implementations of SAE and EAP-pwd in hostapd and wpa_supplicant 2.x through 2.8 are vulnerable to side-channel attacks as a result of o
    24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:hostapd2.8-r0 · Alpine:v3.10Package registry (OSV)
alpine:wpa_supplicant2.7-r3 · Alpine:v3.10Package registry (OSV)
debian:wpa2:2.7+git20190128+0c1e29f-5 · Debian:12Package registry (OSV)
opensuse:wpa_supplicant2.9-lp151.5.10.1 · openSUSE:Leap 15.1Package registry (OSV)
suse:wpa_supplicant2.9-4.20.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (14 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records