CVE-2019-9495
LOWEPSS 88th pctlDescription
The implementations of EAP-PWD in hostapd and wpa_supplicant are vulnerable to side-channel attacks as a result of cache access patterns. All versions of hostapd and wpa_supplicant with EAP-PWD support are vulnerable. The ability to install and execute applications is necessary for a successful attack. Memory access patterns are visible in a shared cache. Weak passwords may be cracked. Versions of hostapd/wpa_supplicant 2.7 and newer, are not vulnerable to the timing attack described in CVE-2019-9494. Both hostapd with EAP-pwd support and wpa_supplicant with EAP-pwd support prior to and including version 2.7 are affected.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploit Intelligence
Elevated risk: more likely to be exploited than 88% of all known CVEs.
References
Related Vulnerabilities
Other CWE-524 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2019-9494 | Medium | 5.9 | 3.9% | - | Fix |
| CVE-2021-24027 | High | 7.5 | 3.8% | - | Fix |
| CVE-2019-14997 | Medium | 4.3 | 1.2% | - | Fix |
| CVE-2024-0874 | Medium | 5.3 | 0.8% | - | Fix |
| CVE-2024-45596 | High | 7.4 | 0.6% | - | Fix |
| CVE-2021-44854 | Medium | 5.3 | 0.6% | - | Fix |
Common questions
How do I fix CVE-2019-9495?
Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2019-9495 being actively exploited?
Not that we know of. CVE-2019-9495 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.4% is the estimated probability that it will be exploited in the next 30 days. That is higher than 88% of all scored CVEs.
How severe is CVE-2019-9495?
CVE-2019-9495 has a CVSS v3 base score of 3.7, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2019-9495 affect?
Published advisories record a fix for wpa (Debian), hostapd (Ubuntu), wpa (Ubuntu), wpasupplicant (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.