PT-2021-4768 · Cisco · Cisco Ios Xe

Published 2021-09-22 · Updated 2021-10-13 · CVE-2021-34769

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cisco IOS XE Software for Cisco Catalyst 9000 Family Wireless Controllers (affected versions not specified)

Description The issue is related to insufficient validation of CAPWAP packets in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing. An unauthenticated, remote attacker could exploit this by sending a malformed CAPWAP packet to an affected device, potentially causing the device to crash and reload, resulting in a denial of service (DoS) condition.

Recommendations For Cisco IOS XE Software for Cisco Catalyst 9000 Family Wireless Controllers, update to a version that includes the software updates released by Cisco to address this issue. As a temporary workaround, consider restricting access to the CAPWAP protocol to minimize the risk of exploitation.

Fix

DoS

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

BDU:2021-05487

CVE-2021-34769

Affected Products

Cisco Ios Xe

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2021-34769 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-capwap-dos-gmNjdKOY · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05487 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/669669 · Security Note
• https://osv.dev/vulnerability/CVE-2021-34769 · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-capwap-dos-gmNjdKOY · Vendor Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-capwap-dos-gmNjdKOY?vsfCisco20Security20AdvisoryvscatSecurity20IntelligencevstypeRSSvspCisco20IOS20XE20Software20for20Catalyst20900020Family20Wireless20Controllers20CAPWAP20Denial20of20Service20Vulnerabilitiesvsk1 · Note