CVE-2021-40118

HighCVSS 7.5/10Last modified Aug 11, 2026

Description

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a malicious HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-121 CWE-787

Affected software

No affected versions have been published.

Timeline

Published: Oct 27, 2021
Last modified: Aug 11, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-401199.8A vulnerability in the key-based SSH authentication mechanism of Cisco Policy Suite could allow an unauthenticated, remote attacker to log i CVE-2021-401207.2A vulnerability in the web-based management interface of certain Cisco Small Business RV Series Routers could allow an authenticated, remote CVE-2021-401214.8Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) Software could allow an attacker to c CVE-2021-401227.5A vulnerability in an API of the Call Bridge feature of Cisco Meeting Server could allow an unauthenticated, remote attacker to cause a deni CVE-2021-401236.5A vulnerability in the web-based management interface of Cisco Identity Services Engine (ISE) could allow an authenticated, remote attacker CVE-2021-401247.8A vulnerability in the Network Access Manager (NAM) module of Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticat CVE-2021-401256.5A vulnerability in the Internet Key Exchange Version 2 (IKEv2) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco CVE-2021-401264.3A vulnerability in the web-based dashboard of Cisco Umbrella could allow an authenticated, remote attacker to perform an email enumeration a CVE-2021-401275.3A vulnerability in the web-based management interface of Cisco Small Business 200 Series Smart Switches, Cisco Small Business 300 Series Man CVE-2021-401285.3A vulnerability in the account activation feature of Cisco Webex Meetings could allow an unauthenticated, remote attacker to send an account CVE-2021-401294.9A vulnerability in the configuration dashboard of Cisco Common Services Platform Collector (CSPC) could allow an authenticated, remote attac CVE-2021-401304.9A vulnerability in the web application of Cisco Common Services Platform Collector (CSPC) could allow an authenticated, remote attacker to s