CVE-2022-20728: Cisco Aironet 1542d Firmware

Medium severity, CVSS 4.7. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

  • Cisco Aironet 1542d Firmware: version 017.006(001) only
  • Cisco Aironet 1542i Firmware: version 017.006(001) only
  • Cisco Aironet 1562d Firmware: version 017.006(001) only
  • Cisco Aironet 1562e Firmware: version 017.006(001) only
  • Cisco Aironet 1562i Firmware: version 017.006(001) only
  • Cisco Aironet 1815i Firmware: version 017.006(001) only
  • Cisco Aironet 1815m Firmware: version 017.006(001) only
  • Cisco Aironet 1815t Firmware: version 017.006(001) only
  • Cisco Aironet 1815w Firmware: version 017.006(001) only
  • Cisco Aironet 1830 Firmware: version 017.006(001) only
  • Cisco Aironet 1840 Firmware: version 017.006(001) only
  • Cisco Aironet 1850e Firmware: version 017.006(001) only
  • Cisco Aironet 1850i Firmware: version 017.006(001) only
  • Cisco Aironet 2800e Firmware: version 017.006(001) only
  • Cisco Aironet 2800i Firmware: version 017.006(001) only
  • Cisco Aironet 3800e Firmware: version 017.006(001) only
  • Cisco Aironet 3800i Firmware: version 017.006(001) only
  • Cisco Aironet 3800p Firmware: version 017.006(001) only
  • Cisco Aironet 4800 Firmware: version 017.006(001) only
  • Cisco Catalyst 9105ax Firmware: version 017.006(001) only
  • Cisco Catalyst 9115ax Firmware: version 017.006(001) only
  • Cisco Catalyst 9117ax Firmware: version 017.006(001) only
  • Cisco Catalyst 9120ax Firmware: version 017.006(001) only
  • Cisco Catalyst 9124ax Firmware: version 017.006(001) only
  • Cisco Catalyst 9130ax Firmware: version 017.006(001) only
  • and 1 more

Published 2022-09-30. Last modified 2026-06-17.