What is the severity of CVE-2020-3516?

CVE-2020-3516 has a medium severity rating, allowing an authenticated attacker to crash the web server.

How do I fix CVE-2020-3516?

To mitigate CVE-2020-3516, upgrade Cisco IOS XE Software to a version that is not affected by this vulnerability.

What devices are affected by CVE-2020-3516?

CVE-2020-3516 affects multiple versions of Cisco IOS XE Software, including versions prior to 16.9.6 and various versions in the 16.12.x and 17.1.x ranges.

Who can exploit CVE-2020-3516?

CVE-2020-3516 can be exploited by authenticated remote attackers due to inadequate input validation during the web server authentication process.

What symptoms indicate an exploit of CVE-2020-3516?

An exploit of CVE-2020-3516 would likely lead to crashes of the web server on affected Cisco devices.

Vulnerability/
CVE-2020-3516

medium

4.3

CWE

24/9/2020

13/11/2024

CVE-2020-3516: Cisco IOS XE Software Web UI Improper Input Validation Vulnerability

First published: Thu Sep 24 2020(Updated: )

A vulnerability in the web server authentication of Cisco IOS XE Software could allow an authenticated, remote attacker to crash the web server on the device. The vulnerability is due to insufficient input validation during authentication. An attacker could exploit this vulnerability by entering unexpected characters during a valid authentication. A successful exploit could allow the attacker to crash the web server on the device, which must be manually recovered by disabling and re-enabling the web server.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco IOS XE Web UI	<16.9.6
Cisco IOS XE Web UI	>=16.12.0<16.12.2
Cisco IOS XE Web UI	>=17.1.0<17.1.1
Cisco IOS XE Web UI	=17.2.1

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-WEB-UI-exNFmcPO

Frequently Asked Questions

What is the severity of CVE-2020-3516?
CVE-2020-3516 has a medium severity rating, allowing an authenticated attacker to crash the web server.
How do I fix CVE-2020-3516?
To mitigate CVE-2020-3516, upgrade Cisco IOS XE Software to a version that is not affected by this vulnerability.
What devices are affected by CVE-2020-3516?
CVE-2020-3516 affects multiple versions of Cisco IOS XE Software, including versions prior to 16.9.6 and various versions in the 16.12.x and 17.1.x ranges.
Who can exploit CVE-2020-3516?
CVE-2020-3516 can be exploited by authenticated remote attackers due to inadequate input validation during the web server authentication process.
What symptoms indicate an exploit of CVE-2020-3516?
An exploit of CVE-2020-3516 would likely lead to crashes of the web server on affected Cisco devices.

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canonical/cisco ios xe web ui
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version/cisco ios xe web ui/17.1.0
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