Cisco Access Points VLAN Bypass from Native VLAN Vulnerability
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.
- Published
- Sep 30, 2022
- Updated
- Jun 17, 2026
- EPSS
- 0.3% · 17th percentile
- CWE
- CWE-284
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Report tools
Action score
18
Monitor
Low priority for now.
- CVSS
- 18 / 40 · 4.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 4.7
- CNA · cisco
- 4.7
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| cisco | aironet 1542d firmware | cpe:2.3:o:cisco:aironet_1542d_firmware |
| cisco | aironet 1542d | cpe:2.3:h:cisco:aironet_1542d |
| cisco | aironet 1542i firmware | cpe:2.3:o:cisco:aironet_1542i_firmware |
| cisco | aironet 1542i | cpe:2.3:h:cisco:aironet_1542i |
| cisco | aironet 1562i firmware | cpe:2.3:o:cisco:aironet_1562i_firmware |
| cisco | aironet 1562i | cpe:2.3:h:cisco:aironet_1562i |
| cisco | aironet 1562e firmware | cpe:2.3:o:cisco:aironet_1562e_firmware |
| cisco | aironet 1562e | cpe:2.3:h:cisco:aironet_1562e |
| cisco | aironet 1562d firmware | cpe:2.3:o:cisco:aironet_1562d_firmware |
| cisco | aironet 1562d | cpe:2.3:h:cisco:aironet_1562d |
| cisco | aironet 1815i firmware | cpe:2.3:o:cisco:aironet_1815i_firmware |
| cisco | aironet 1815i | cpe:2.3:h:cisco:aironet_1815i |
and 40 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- cisco aironet 1542d firmware017.006(001)
- cisco aironet 1542i firmware017.006(001)
- cisco aironet 1562d firmware017.006(001)
- cisco aironet 1562e firmware017.006(001)
- cisco aironet 1562i firmware017.006(001)
- cisco aironet 1815i firmware017.006(001)
- cisco aironet 1815m firmware017.006(001)
- cisco aironet 1815t firmware017.006(001)
- cisco aironet 1815w firmware017.006(001)
- cisco aironet 1830 firmware017.006(001)
- cisco aironet 1840 firmware017.006(001)
- cisco aironet 1850e firmware017.006(001)
- cisco aironet 1850i firmware017.006(001)
- cisco aironet 2800e firmware017.006(001)
- cisco aironet 2800i firmware017.006(001)
- cisco aironet 3800e firmware017.006(001)
- cisco aironet 3800i firmware017.006(001)
- cisco aironet 3800p firmware017.006(001)
- cisco aironet 4800 firmware017.006(001)
- cisco catalyst 9105ax firmware017.006(001)
Versions reported by the vendor
Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.
Cisco Cisco Aironet Access Point Software (IOS XE Controller)
- n/aaffected
Same product
cisco: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-1419Cisco Access Points SSH Management Privilege Escalation Vulnerability31Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone on the same network segment can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- low · data or configuration can be modified
- Availability
- none
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Adjacent
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- None
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-284 · Improper Access ControlCVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Embedding Scripts within ScriptsCAPEC-19likelihood: High · High
- Malicious Logic InsertionCAPEC-441likelihood: Medium · High
- Modification of Windows Service ConfigurationCAPEC-478likelihood: Low · High
- Malicious Root CertificateCAPEC-479likelihood: Low · Low
- Intent SpoofCAPEC-502
- WebView ExposureCAPEC-503
- Data Injected During ConfigurationCAPEC-536likelihood: Low · High
- Incomplete Data Deletion in a Multi-Tenant EnvironmentCAPEC-546likelihood: Low · Medium
ATT&CK techniques
- RootkitT1014
- Obfuscated Files or Information: Embedded PayloadsT1027.009
- Boot or Logon Initialization ScriptsT1037
- Taint shared contentT1080
- Server Software Component: Terminal Services DLLT1505.005
- Pre-OS Boot:BootkitT1542.003
- Create or Modify System ProcessT1543
- Create or Modify System Process: Launch AgentT1543.001
- Create or Modify System Process:Windows ServiceT1543.003
- Create or Modify System Process: Launch DaemonT1543.004
- Event Triggered Execution:Change Default File AssociationT1546.001
- Event Triggered Execution:.bash_profile and .bashrcT1546.004
- Event Triggered Execution: Accessibility FeaturesT1546.008
- Event Triggered Execution: Installer PackagesT1546.016
- Boot or Logon Autostart ExecutionT1547
- Boot or Logon Autostart Execution:Kernel Modules and ExtensionsT1547.006
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.