# What is CVE-2022-20728?

> CVE-2022-20728 is a medium-severity flaw (CVSS 4.7) in Aironet 1542d from Cisco, published on 30 September 2022. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 0.3%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2022-20728

## At a glance

- **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle.
- **Precursor Intelligence risk score:** 20 out of 100 (Low); action: Monitor. Kept up to date as the evidence changes.
- **Severity:** Medium (CVSS 4.7 out of 10)
- **Known to be exploited:** No, not on the list of flaws known to be exploited today
- **Chance of use in the next 30 days:** 0.3% (latest exploit-likelihood forecast)
- **Published:** 30 September 2022
- **Record last updated:** 7 November 2023
- **Main product:** Aironet 1542d from Cisco
- **Affected products:** 52

## What is CVE-2022-20728? In plain terms

An attacker has to be on the same local network without logging in, and nobody has to click anything. If it works, the attacker can change some data.

### The official 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.

### What kind of flaw is it?

- CWE-284: Improper Access Control

### How an attack on it works

- Where an attacker can be: On the same local network
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- Does someone have to click: No, nobody has to do anything
- What an attacker gets: Can change some data

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

## Is CVE-2022-20728 being exploited? Not that we know of

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.3%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 0.3%, 0.3%, 0.3%, 0.3%, 0.3%, 0.3%, 0.3%.

### Timeline

- 30 September 2022: Published
- 7 November 2023: Record last updated

### How Precursor Intelligence ranks it

CVE-2022-20728 scores **20 out of 100 (Low)**, with the action "Monitor".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: smaller factor
- Threat activity around it: smaller factor

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2022-20728?

The published record lists 52 products.

- [Aironet 1542d](https://www.precursorintelligence.com/product/cisco/aironet_1542d) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1542d Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1542d_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1542i](https://www.precursorintelligence.com/product/cisco/aironet_1542i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1542i Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1542i_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1562d](https://www.precursorintelligence.com/product/cisco/aironet_1562d) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1562d Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1562d_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1562e](https://www.precursorintelligence.com/product/cisco/aironet_1562e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1562e Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1562e_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1562i](https://www.precursorintelligence.com/product/cisco/aironet_1562i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1562i Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1562i_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1815i](https://www.precursorintelligence.com/product/cisco/aironet_1815i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1815i Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1815i_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1815m](https://www.precursorintelligence.com/product/cisco/aironet_1815m) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1815m Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1815m_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1815t](https://www.precursorintelligence.com/product/cisco/aironet_1815t) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1815t Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1815t_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1815w](https://www.precursorintelligence.com/product/cisco/aironet_1815w) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1815w Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1815w_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1830](https://www.precursorintelligence.com/product/cisco/aironet_1830) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1830 Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1830_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1840](https://www.precursorintelligence.com/product/cisco/aironet_1840) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1840 Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1840_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1850e](https://www.precursorintelligence.com/product/cisco/aironet_1850e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1850e Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1850e_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 1850i](https://www.precursorintelligence.com/product/cisco/aironet_1850i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1850i Firmware](https://www.precursorintelligence.com/product/cisco/aironet_1850i_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 2800e](https://www.precursorintelligence.com/product/cisco/aironet_2800e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 2800e Firmware](https://www.precursorintelligence.com/product/cisco/aironet_2800e_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 2800i](https://www.precursorintelligence.com/product/cisco/aironet_2800i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 2800i Firmware](https://www.precursorintelligence.com/product/cisco/aironet_2800i_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 3800e](https://www.precursorintelligence.com/product/cisco/aironet_3800e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 3800e Firmware](https://www.precursorintelligence.com/product/cisco/aironet_3800e_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 3800i](https://www.precursorintelligence.com/product/cisco/aironet_3800i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 3800i Firmware](https://www.precursorintelligence.com/product/cisco/aironet_3800i_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 3800p](https://www.precursorintelligence.com/product/cisco/aironet_3800p) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 3800p Firmware](https://www.precursorintelligence.com/product/cisco/aironet_3800p_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Aironet 4800](https://www.precursorintelligence.com/product/cisco/aironet_4800) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 4800 Firmware](https://www.precursorintelligence.com/product/cisco/aironet_4800_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Catalyst 9105ax](https://www.precursorintelligence.com/product/cisco/catalyst_9105ax) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9105ax Firmware](https://www.precursorintelligence.com/product/cisco/catalyst_9105ax_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Catalyst 9115ax](https://www.precursorintelligence.com/product/cisco/catalyst_9115ax) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9115ax Firmware](https://www.precursorintelligence.com/product/cisco/catalyst_9115ax_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Catalyst 9117ax](https://www.precursorintelligence.com/product/cisco/catalyst_9117ax) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9117ax Firmware](https://www.precursorintelligence.com/product/cisco/catalyst_9117ax_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Catalyst 9120ax](https://www.precursorintelligence.com/product/cisco/catalyst_9120ax) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9120ax Firmware](https://www.precursorintelligence.com/product/cisco/catalyst_9120ax_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Catalyst 9124ax](https://www.precursorintelligence.com/product/cisco/catalyst_9124ax) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9124ax Firmware](https://www.precursorintelligence.com/product/cisco/catalyst_9124ax_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Catalyst 9130ax](https://www.precursorintelligence.com/product/cisco/catalyst_9130ax) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9130ax Firmware](https://www.precursorintelligence.com/product/cisco/catalyst_9130ax_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)
- [Catalyst Iw6300](https://www.precursorintelligence.com/product/cisco/catalyst_iw6300) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst Iw6300 Firmware](https://www.precursorintelligence.com/product/cisco/catalyst_iw6300_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 017.006(001)

## How do I fix CVE-2022-20728?

1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list.
3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.

### References

- [tools.cisco.com](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY) (Vendor advisory)

## Questions

### What is CVE-2022-20728?

CVE-2022-20728 is a medium-severity flaw in Aironet 1542d from Cisco, published on 30 September 2022. An attacker has to be on the same local network without logging in, and nobody has to click anything. If it works, the attacker can change some data.

### How serious is CVE-2022-20728?

It scores 4.7 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2022-20728 is 20 out of 100, which is Low. Its action is "Monitor". No sign of exploitation and a low forecast. Patch it in your normal update cycle.

### Is CVE-2022-20728 being exploited?

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.3%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2022-20728 affect?

For Aironet 1542d from Cisco: version not specified. The record lists 52 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2022-20728?

Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.

## Does CVE-2022-20728 affect you?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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