CVE-2022-20728

mediumpriority · track · 19EPSS 0.003 · 19 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.27% (19th) EPSS

CVSS 4.7 · medium

Is it mine?

43 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Aironet Access Point Software (IOS XE Controller)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

4.7

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.14.7mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 1.4

v3.14.7mediumAV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.14.7mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · ENISA EU

v3.14.7mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · psirt@cisco.com USexploitability 2.8 · impact 1.4

v3.14.3mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.14.7mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-284USCWE-284US

affected products (43)

Products and version ranges known to be affected.

Cisco Cisco Aironet Access Point Software (IOS XE Controller)all versionscisco_csafUS
Cisco Cisco Aironet Access Point Software (IOS XE Controller)≤ n/aenisa_euvdEU
Cisco Systems Inc. Catalyst 9800≤ 17.3.6 + APSP patchfstec_bduRU
Cisco Systems Inc. Catalyst 980017.4 → 17.6.2fstec_bduRU
Cisco Systems Inc. Catalyst IW 6300all versionsfstec_bduRU
Cisco Systems Inc. Cisco Aironet 1540all versionsfstec_bduRU
Cisco Systems Inc. Cisco Aironet 1560all versionsfstec_bduRU
Cisco Systems Inc. Cisco Aironet 1800all versionsfstec_bduRU
Cisco Systems Inc. Cisco Aironet 2800all versionsfstec_bduRU
Cisco Systems Inc. Cisco Aironet 3800all versionsfstec_bduRU
Cisco Systems Inc. Cisco Aironet 4800all versionsfstec_bduRU
Cisco Systems Inc. Cisco Business 100 Series Access Pointsall versionsfstec_bduRU
Cisco Systems Inc. Cisco Business 200 Series Access Pointsall versionsfstec_bduRU
Cisco Systems Inc. Cisco Catalyst 9100all versionsfstec_bduRU
Cisco Systems Inc. ESW 6300all versionsfstec_bduRU
Cisco Systems Inc. Integrated AP on 1100 Integrated Services Routersall versionsfstec_bduRU
Cisco Systems Inc. Wireless LAN controller≤ 8.10.181.0fstec_bduRU
cisco aironet 1542d firmware= 017.006(001)nvdUScpe:2.3:o:cisco:aironet_1542d_firmware:*:*:*:*:*:*:*:*
cisco aironet 1542i firmware= 017.006(001)nvdUScpe:2.3:o:cisco:aironet_1542i_firmware:*:*:*:*:*:*:*:*
cisco aironet 1562d firmware= 017.006(001)nvdUScpe:2.3:o:cisco:aironet_1562d_firmware:*:*:*:*:*:*:*:*

showing 20 of 43

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-apvlan-TDTtb4FYCisco Access Points VLAN Bypass from Native VLAN Vulnerability2022-09-27csaf · cisco_csafUS
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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2022-09-30modified 2026-06-17

references (6)

External citations — patches, advisories, analysis.

scry

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