CVE-2021-34769 : Multiple vulnerabilities in the Control and Provisioning of Wireless Access Poin

Multiple vulnerabilities in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE Software for Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. These vulnerabilities are due to insufficient validation of CAPWAP packets. An attacker could exploit the vulnerabilities by sending a malformed CAPWAP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to crash and reload, resulting in a DoS condition.

Published 2021-09-23 03:15:21

Updated 2021-10-13 14:48:13

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2021-34769

Cisco » Ios Xe » Version: 3.15.1xbs
cpe:2.3:o:cisco:ios_xe:3.15.1xbs:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Catalyst 9800 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A
When used together with: Cisco » Catalyst 9800 Embedded Wireless Controller » Version: N/A
Cisco » Ios Xe » Version: 3.15.2xbs
cpe:2.3:o:cisco:ios_xe:3.15.2xbs:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Catalyst 9800 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A
When used together with: Cisco » Catalyst 9800 Embedded Wireless Controller » Version: N/A
Cisco » Ios Xe » Version: 17.3.1
cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Catalyst 9800 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A
When used together with: Cisco » Catalyst 9800 Embedded Wireless Controller » Version: N/A
Cisco » Ios Xe » Version: 17.3.2
cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Catalyst 9800 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A
When used together with: Cisco » Catalyst 9800 Embedded Wireless Controller » Version: N/A
Cisco » Ios Xe » Version: 17.3.2a
cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Catalyst 9800 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A
When used together with: Cisco » Catalyst 9800 Embedded Wireless Controller » Version: N/A
Cisco » Ios Xe » Version: 17.4.1
cpe:2.3:o:cisco:ios_xe:17.4.1:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Catalyst 9800 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A
When used together with: Cisco » Catalyst 9800 Embedded Wireless Controller » Version: N/A
Cisco » Ios Xe » Version: 17.5.1
cpe:2.3:o:cisco:ios_xe:17.5.1:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Catalyst 9800 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-40 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 Wireless Controller » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A
When used together with: Cisco » Catalyst 9800 Embedded Wireless Controller » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-34769

EPSS FAQ

0.16%

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

~ 52 %

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

CVSS scores for CVE-2021-34769

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.8	HIGH	AV:N/AC:L/Au:N/C:N/I:N/A:C	10.0	6.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
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
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-34769

CWE-415 Double Free

The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.
Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)

References for CVE-2021-34769

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-capwap-dos-gmNjdKOY

Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Denial of Service Vulnerabilities
Vendor Advisory

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Vulnerability Details : CVE-2021-34769

Products affected by CVE-2021-34769

Exploit prediction scoring system (EPSS) score for CVE-2021-34769

CVSS scores for CVE-2021-34769

CWE ids for CVE-2021-34769

References for CVE-2021-34769