PoC Index

CVE-2021-34767

HIGH 7.4EPSS 0.8%

A vulnerability in IPv6 traffic processing of Cisco IOS XE Wireless Controller Software for Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, adjacent attacker to cause a Layer 2 (L2) loop in a configured VLAN, resulting in a denial of service (DoS) condition for that VLAN. The vulnerability is due to a logic error when processing specific link-local IPv6 traffic. An attacker could exploit this vulnerability by sending a crafted IPv6 packet that would flow inbound through the wired interface of an affected device. A successful exploit could allow the attacker to cause traffic drops in the affected VLAN, thus triggering the DoS condition.

CVSS v3.1
7.4 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS v3.1
7.4 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS v2.0
3.3 LOWAV:A/AC:L/Au:N/C:N/I:N/A:P
EPSS
0.78% chance of exploitation in the next 30 days, 54th percentile
Published
2021-09-23
Updated
2024-11-07

Proof-of-concept exploits (1)

References

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