CVE-2019-9496: An invalid authentication sequence could result in the hostapd process terminating due to missing state validation steps
Vulnerability summary
CVE-2019-9496 is a high (CVSS 7.5) External Control of Critical State Data vulnerability in fedoraproject fedora. EPSS estimates a 4.63% chance of exploitation in the next 30 days, higher than 91.7% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 5% (FIRST, 04-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 17-04-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An invalid authentication sequence could result in the hostapd process terminating due to missing state validation steps when processing the SAE confirm message when in hostapd/AP mode. All version of hostapd with SAE support are vulnerable. An attacker may force the hostapd process to terminate, performing a denial of service attack. Both hostapd with SAE support and wpa_supplicant with SAE support prior to and including version 2.7 are affected.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
4.63%
Chance of exploitation in the next 30 days
Percentile
92%
Versus all other CVEs
30-day change
Decrease -0.04 pp
From 4.67% on 05-10-2026
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 cause- CWE-642External Control of Critical State DataThe product stores security-critical state information about its users, or the product itself, in a location that is accessible to unauthorized actors.
- CWE-287Improper AuthenticationWhen an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
W1.fi2 products
- hostapd≤ 2.7
- wpa_supplicant≤ 2.7
Wi-fi alliance2 products
Alpine1 product
- hostapd< 2.8-r0 | < 2.6-r3 | < 2.6-r5 | < 2.6-r6 | < 2.7-r3
Debian1 product
- wpa< 2:2.7+git20190128+0c1e29f-4
Fedoraproject1 product
- fedoraEOL28 | 29 | 30
5 vendors · 7 products
References
11 links- www.synology.com/security/advisory/Synology_SA_19_16X Refsource CONFIRM
