What is CVE-2021-34767?

CVE-2021-34767 is a high-severity vulnerability in Cisco Catalyst_9800, classified under Always-Incorrect Control Flow Implementation. CVSS score: 7.4/10. Published 2021-09-23.

How severe is CVE-2021-34767?

High severity. CVSS v3 base score is 7.4 out of 10.

Is CVE-2021-34767 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Cisco Catalyst_9800

CVE-2021-34767

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…

EPSS: 0.008 (50.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Catalyst_9800
Cisco Catalyst_9800-40
Cisco Catalyst_9800-80
Cisco Catalyst_9800-cl
Cisco Catalyst_9800_embedded_wireless_controller
Cisco Catalyst_9800-l
Cisco Catalyst_9800-l-c
Cisco Catalyst_9800-l-f
Cisco Ios Xe Software — versions n/a
Cisco Ios_xe — versions 3.15.1xbs, 3.15.2xbs, 16.7.1

Weakness classification (CWE)

CWE-670 — Always-Incorrect Control Flow Implementation

Public proof-of-concept exploits

lukejenkins/CVE-2021-34767

References

psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-34767?: CVE-2021-34767 is a high-severity vulnerability in Cisco Catalyst_9800, classified under Always-Incorrect Control Flow Implementation. CVSS score: 7.4/10. Published 2021-09-23.
How severe is CVE-2021-34767?: High severity. CVSS v3 base score is 7.4 out of 10.
Is CVE-2021-34767 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.