CVE-2026-20084
CVE-2026-20084: 1 tracked advisory record across Cisco. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Cisco
1 advisory- Advisory severityHigh8.6
High [CVE-2026-20084] Cisco IOS XE Software for Catalyst 9000 Series Switches DHCP Snooping Denial of Service Vulnerability
cisco-sa-bootp-WuBhNBxASource published Source updated
A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utiliz…
- Related products — impact not confirmed
- Cisco IOS XE Software 16.6.1
- Cisco IOS XE Software 16.6.2
- Cisco IOS XE Software 16.6.3
- Cisco IOS XE Software 16.6.5
3 more entries in the full advisory.
- Source-reported affected versions
- Scope: This vulnerability affects Cisco Catalyst 9000 Series Switches if they are running a vulnerable release of Cisco IOS XE Software and have the following configuration conditions:
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
- Workarounds
- There is a workaround that addresses this vulnerability.
- For environments that do not need to handle BOOTP traffic, configure ip dhcp relay bootp ignore on the affected device.
- While this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer depl…
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