# What is CVE-2020-3560?

> CVE-2020-3560 is a high-severity flaw (CVSS 8.6) in Wireless LAN Controller from Cisco, published on 24 September 2020. 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 1.4%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2020-3560

## 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:** 47 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes.
- **Severity:** High (CVSS 8.6 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:** 1.4% (latest exploit-likelihood forecast)
- **Published:** 24 September 2020
- **Record last updated:** 16 April 2021
- **Main product:** Wireless LAN Controller from Cisco
- **Affected products:** 49

## What is CVE-2020-3560? In plain terms

It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### The official description

A vulnerability in Cisco Aironet Access Points (APs) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) on an affected device. The vulnerability is due to improper resource management while processing specific packets. An attacker could exploit this vulnerability by sending a series of crafted UDP packets to a specific port on an affected device. A successful exploit could either allow the attacker to tear down the connection between the AP and the wireless LAN controller, resulting in the affected device not being able to process client traffic, or cause the vulnerable device to reload, triggering a DoS condition. After the attack, the affected device should automatically recover its normal functions without manual intervention.

### What kind of flaw is it?

- CWE-400: Uncontrolled Resource Consumption

### How an attack on it works

- Where an attacker can be: Anywhere on the internet
- 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 take it offline

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

## Is CVE-2020-3560 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 1.4%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 1.4%, 1.4%, 1.4%, 1.4%, 1.4%, 1.4%, 1.4%.

### Timeline

- 24 September 2020: Published
- 16 April 2021: Record last updated

### How Precursor Intelligence ranks it

CVE-2020-3560 scores **47 out of 100 (Medium)**, with the action "Plan remediation".

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-2020-3560?

The published record lists 49 products. Versions are as published: "8.9 to before 8.10.112.0" means from 8.9 up to, but not including, 8.10.112.0.

- [Wireless LAN Controller](https://www.precursorintelligence.com/product/cisco/wireless_lan_controller) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 8.9 to before 8.10.112.0
- [Aironet Access Point Software](https://www.precursorintelligence.com/product/cisco/aironet_access_point_software) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 8.10(105.0), 8.10(105.4), 8.5(154.27), 8.8(125.0), 17.1.2.6, 17.1.2.9, 17.2.0.37
- [Wireless LAN Controller Software](https://www.precursorintelligence.com/product/cisco/wireless_lan_controller_software) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): before 8.5.161.0, 8.6 to before 8.8.130.0
- [1111-4pwe](https://www.precursorintelligence.com/product/cisco/1111-4pwe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1111-8plteeawb](https://www.precursorintelligence.com/product/cisco/1111-8plteeawb) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1111-8pwb](https://www.precursorintelligence.com/product/cisco/1111-8pwb) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1113-8plteeawe](https://www.precursorintelligence.com/product/cisco/1113-8plteeawe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1113-8pmwe](https://www.precursorintelligence.com/product/cisco/1113-8pmwe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1113-8pwe](https://www.precursorintelligence.com/product/cisco/1113-8pwe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1116-4plteeawe](https://www.precursorintelligence.com/product/cisco/1116-4plteeawe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1116-4pwe](https://www.precursorintelligence.com/product/cisco/1116-4pwe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1117-4plteeawe](https://www.precursorintelligence.com/product/cisco/1117-4plteeawe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1117-4pmlteeawe](https://www.precursorintelligence.com/product/cisco/1117-4pmlteeawe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1117-4pmwe](https://www.precursorintelligence.com/product/cisco/1117-4pmwe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [1117-4pwe](https://www.precursorintelligence.com/product/cisco/1117-4pwe) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Access Points](https://www.precursorintelligence.com/product/cisco/access_points) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): before 16.12.4a
- [Aironet 1542d](https://www.precursorintelligence.com/product/cisco/aironet_1542d) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1542i](https://www.precursorintelligence.com/product/cisco/aironet_1542i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1562d](https://www.precursorintelligence.com/product/cisco/aironet_1562d) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1562e](https://www.precursorintelligence.com/product/cisco/aironet_1562e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1562i](https://www.precursorintelligence.com/product/cisco/aironet_1562i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1815](https://www.precursorintelligence.com/product/cisco/aironet_1815) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1830e](https://www.precursorintelligence.com/product/cisco/aironet_1830e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1830i](https://www.precursorintelligence.com/product/cisco/aironet_1830i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1850e](https://www.precursorintelligence.com/product/cisco/aironet_1850e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 1850i](https://www.precursorintelligence.com/product/cisco/aironet_1850i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 2800e](https://www.precursorintelligence.com/product/cisco/aironet_2800e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 2800i](https://www.precursorintelligence.com/product/cisco/aironet_2800i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 3800e](https://www.precursorintelligence.com/product/cisco/aironet_3800e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 3800i](https://www.precursorintelligence.com/product/cisco/aironet_3800i) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 3800p](https://www.precursorintelligence.com/product/cisco/aironet_3800p) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Aironet 4800](https://www.precursorintelligence.com/product/cisco/aironet_4800) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Business 140ac](https://www.precursorintelligence.com/product/cisco/business_140ac) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Business 145ac](https://www.precursorintelligence.com/product/cisco/business_145ac) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Business 240ac](https://www.precursorintelligence.com/product/cisco/business_240ac) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Business Access Points](https://www.precursorintelligence.com/product/cisco/business_access_points) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 10.0 to before 10.1.1.0
- [Catalyst 9105](https://www.precursorintelligence.com/product/cisco/catalyst_9105) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9115](https://www.precursorintelligence.com/product/cisco/catalyst_9115) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9117](https://www.precursorintelligence.com/product/cisco/catalyst_9117) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9120](https://www.precursorintelligence.com/product/cisco/catalyst_9120) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9130](https://www.precursorintelligence.com/product/cisco/catalyst_9130) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9800-40](https://www.precursorintelligence.com/product/cisco/catalyst_9800-40) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9800-80](https://www.precursorintelligence.com/product/cisco/catalyst_9800-80) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9800-Cl](https://www.precursorintelligence.com/product/cisco/catalyst_9800-cl) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9800-L](https://www.precursorintelligence.com/product/cisco/catalyst_9800-l) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9800-L-C](https://www.precursorintelligence.com/product/cisco/catalyst_9800-l-c) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 9800-L-F](https://www.precursorintelligence.com/product/cisco/catalyst_9800-l-f) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst Iw6300](https://www.precursorintelligence.com/product/cisco/catalyst_iw6300) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Esw-6300-Con-X-K9](https://www.precursorintelligence.com/product/cisco/esw-6300-con-x-k9) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified

## How do I fix CVE-2020-3560?

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-aironet-dos-VHr2zG9y) (Vendor advisory)

## Questions

### What is CVE-2020-3560?

CVE-2020-3560 is a high-severity flaw in Wireless LAN Controller from Cisco, published on 24 September 2020. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### How serious is CVE-2020-3560?

It scores 8.6 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2020-3560 is 47 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle.

### Is CVE-2020-3560 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 1.4%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2020-3560 affect?

For Wireless LAN Controller from Cisco: 8.9 to before 8.10.112.0. The record lists 49 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2020-3560?

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-2020-3560 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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