Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2021-34767 |
CWE-ID | CWE-670 |
Exploitation vector | Local network |
Public exploit | N/A |
Vulnerable software Subscribe |
Cisco IOS XE Operating systems & Components / Operating system Cisco Catalyst 9800 Wireless Controller Hardware solutions / Routers & switches, VoIP, GSM, etc Catalyst 9800 Wireless Controllers for Cloud Other software / Other software solutions |
Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU56859
Risk: Medium
CVSSv3.1: 6.4 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-34767
CWE-ID:
CWE-670 - Always-Incorrect Control Flow Implementation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of servide (DoS) attack.
The vulnerability exists due to a logic error when processing specific link-local IPv6 traffic. A remote attacker on the local network can send a specially crafted IPv6 packet and cause a denial of service condition on the target system.
MitigationInstall update from vendor's website.
Vulnerable software versionsCisco IOS XE: All versions
Cisco Catalyst 9800 Wireless Controller: All versions
Catalyst 9800 Wireless Controllers for Cloud: All versions
External linkshttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-ipv6-dos-NMYeCnZv
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.