Vulnerability · Published Sep 23, 2021 · Assigned by cisco

CVE-2021-34699Cisco IOS and IOS XE Software TrustSec CLI Parser Denial of Service Vulnerability

High 7.7

In plain English

A high-severity security flaw in Cisco IOS from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 68% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)1.2%top 32.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A vulnerability in the TrustSec CLI parser of Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload. This vulnerability is due to an improper interaction between the web UI and the CLI parser. An attacker could exploit this vulnerability by requesting a particular CLI command to be run through the web UI. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco IOS	n/a

Weakness: CWE-435 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

References

20210922 Cisco IOS and IOS XE Software TrustSec CLI Parser Denial of Service Vulnerability vendor-advisory, x_refsource_CISCO