CVE-2021-1624 : A vulnerability in the Rate Limiting Network Address Translation (NAT) feature o

A vulnerability in the Rate Limiting Network Address Translation (NAT) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause high CPU utilization in the Cisco QuantumFlow Processor of an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to mishandling of the rate limiting feature within the QuantumFlow Processor. An attacker could exploit this vulnerability by sending large amounts of traffic that would be subject to NAT and rate limiting through an affected device. A successful exploit could allow the attacker to cause the QuantumFlow Processor utilization to reach 100 percent on the affected device, resulting in a DoS condition.

Published 2021-09-23 03:15:14

Updated 2023-06-30 17:09:18

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2021-1624

Cisco » Ios Xe
Versions up to, including, (<=) 17.3.3
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asr 1000 » Version: N/A
When used together with: Cisco » Asr 1000-esp100 » Version: N/A
When used together with: Cisco » Asr 1000-x » Version: N/A
When used together with: Cisco » Asr 1001 » Version: N/A
When used together with: Cisco » Asr 1001-hx » Version: N/A
When used together with: Cisco » Asr 1001-hx R » Version: N/A
When used together with: Cisco » Asr 1001-x » Version: N/A
When used together with: Cisco » Asr 1001-x R » Version: N/A
When used together with: Cisco » Asr 1002 » Version: N/A
When used together with: Cisco » Asr 1002-hx » Version: N/A
When used together with: Cisco » Asr 1002-hx R » Version: N/A
When used together with: Cisco » Asr 1002-x » Version: N/A
When used together with: Cisco » Asr 1002-x R » Version: N/A
When used together with: Cisco » Asr 1004 » Version: N/A
When used together with: Cisco » Asr 1006 » Version: N/A
When used together with: Cisco » Asr 1006-x » Version: N/A
When used together with: Cisco » Asr 1009-x » Version: N/A
When used together with: Cisco » Asr 1013 » Version: N/A
When used together with: Cisco » Asr 1023 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-1624

EPSS FAQ

0.16%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 53 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-1624

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
8.6	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	Cisco Systems, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
8.6	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-1624

CWE-399

Assigned by: ykramarz@cisco.com (Secondary)
CWE-400 Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-1624

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ratenat-pYVLA7wM

Cisco IOS XE Software Rate Limiting Network Address Translation Denial of Service Vulnerability
Vendor Advisory

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Vulnerability Details : CVE-2021-1624

Products affected by CVE-2021-1624

Exploit prediction scoring system (EPSS) score for CVE-2021-1624

CVSS scores for CVE-2021-1624

CWE ids for CVE-2021-1624

References for CVE-2021-1624