← Vulnerability feed

Vulnerability record · CVE-2022-20728 · published 30 September 2022

CVE-2022-20728: Cisco aironet 1542d firmware improper access control vulnerability

Cisco · Aironet 1542d Firmware

A vulnerability in the client forwarding code of multiple Cisco Access Points (APs) could allow an unauthenticated, adjacent attacker to inject packets from the native VLAN to clients within nonnative VLANs on an affected device. This vulnerability is due to a logic error on the AP that forwards packets that are destined to a wireless client if they are received on the native VLAN. An attacker could exploit this vulnerability by obtaining access to the native VLAN and directing traffic directly to the client through their MAC/IP combination. A successful exploit could allow the attacker to bypass VLAN separation and potentially also bypass any Layer 3 protection mechanisms that are deployed.

4.7 CVSS 3.1 Medium EPSS 0.27% · top 82.9% CWE-284 · Improper access control
4.7CVSS 3.1 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
26Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A vulnerability in the client forwarding code of multiple Cisco Access Points (APs) could allow an unauthenticated, adjacent attacker to inject packets from the native VLAN to clients within nonnative VLANs on an affected device. This vulnerability is due to a logic error on the AP that forwards packets that are destined to a wireless client if they are received on the native VLAN. An attacker could exploit this vulnerability by obtaining access to the native VLAN and directing traffic directly to the client through their MAC/IP combination. A successful exploit could allow the attacker to bypass VLAN separation and potentially also bypass any Layer 3 protection mechanisms that are deployed.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Affected products

26 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY Vendor Advisory

Track CVE-2022-20728 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2021-1419Cisco aironet 1542d firmware improper access control vulnerabilityA vulnerability in the SSH management feature of multiple Cisco Access Points (APs) platforms could allow a local, authenticated user to modify files…EPSS 0.22%6.5CVE-2020-26140Alfa awus036h firmware broken cryptographic algorithm vulnerabilityAn issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The WEP, WPA, WPA2, and WPA3 implementations accept plaintext frames …EPSS 2.9%6.5CVE-2020-3261Cisco aironet 1542i firmware cross-site request forgery vulnerabilityA vulnerability in the web-based management interface of Cisco Mobility Express Software could allow an unauthenticated, remote attacker to conduct a…EPSS 0.50%6.5CVE-2020-3260Cisco aironet 1542i firmware uncontrolled resource consumption vulnerabilityA vulnerability in Cisco Aironet Series Access Points Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) c…EPSS 0.46%5.3CVE-2020-26139Netbsd improper authentication vulnerabilityAn issue was discovered in the kernel in NetBSD 7.1. An Access Point (AP) forwards EAPOL frames to other clients even though the sender has not yet s…EPSS 6.5%3.5CVE-2020-24588Ieee 802.11 broken cryptographic algorithm vulnerabilityThe 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that the A-MSDU fl…EPSS 3.6%2.6CVE-2020-24587Ieee 802.11 broken cryptographic algorithm vulnerabilityThe 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that all fragments…EPSS 2.6%7.8CVE-2026-81963Windows Update Stack link-following privilege escalationWindows Update Stack resolves links improperly before accessing files, a link-following flaw (CWE-59) compounded by improper access control (CWE-284)…KEVEPSS 0.39%analysed

Source: NIST National Vulnerability Database (record CVE-2022-20728), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.