What is the CVSS score of CVE-2022-20728?

CVE-2022-20728 has a CVSS 3.1 base score of 4.7 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N. EPSS exploitation probability: 0.2%.

Aironet 1542D Firmware CVE-2022-20728

MEDIUM

Improper Access Control (CWE-284)

2022-09-30 psirt@cisco.com

Authentication Bypass Cisco Aironet 1542D Firmware Aironet 1542I Firmware Aironet 1815I Firmware Aironet 2800E Firmware Aironet 2800I Firmware Aironet 3800E Firmware Aironet 3800I Firmware Aironet 3800P Firmware Aironet 4800 Firmware Catalyst Iw6300 Firmware Aironet 1562D Firmware Aironet 1562E Firmware Aironet 1562I Firmware Aironet 1830 Firmware Aironet 1840 Firmware Aironet 1815M Firmware Aironet 1850E Firmware Aironet 1815W Firmware Aironet 1815T Firmware Aironet 1850I Firmware Catalyst 9105Ax Firmware Catalyst 9115Ax Firmware Catalyst 9117Ax Firmware Catalyst 9120Ax Firmware Catalyst 9124Ax Firmware Catalyst 9130Ax Firmware

4.7

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-284 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Access control enforcement MITRE ATT&CK 1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 4.7 (MEDIUM). Attack characteristics: adjacent network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAI

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. Rated medium severity (CVSS 4.7), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-284. 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 include: Cisco Aironet 1542D Firmware, Cisco Aironet 1542I Firmware, Cisco Aironet 1562I Firmware, Cisco Aironet 1562E Firmware, Cisco Aironet 1562D Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 4.7 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score

0.2%

Top 84% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Controlled

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +24

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:o:cisco:aironet_1542d_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1542i_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1562i_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1562e_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1562d_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1815i_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1815m_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1815t_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1815w_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1830_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1840_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1850e_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_1850i_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_2800i_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_2800e_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_3800i_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_3800e_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_3800p_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:aironet_4800_firmware:017.006\(001\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:catalyst_9105ax_firmware:017.006\(001\):*:*:*:*:*:*:*

+ 6 more

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References

Advisories & patches

ADVISORY https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

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