Cisco Catalyst Vulnerabilities & Security Advisories
2 advisories tracked · Cisco Security Advisories · 0 listed in the CISA Known Exploited Vulnerabilities catalog
Every row below is a published Cisco advisory that VulniPulse classified as Catalyst, with the CVEs, affected and fixed releases and exploitation status the vendor stated. Severity mix: 1 high, 1 medium.
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Cisco Security Advisories
Polled via the official Cisco PSIRT RSS feed. Advisory pages are fetched for new items to extract fixed software and workarounds.
Latest Cisco Catalyst advisories
High [CVE-2026-20084] Cisco IOS XE Software for Catalyst 9000 Series Switches DHCP Snooping Denial of Service Vulnerability
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… Affected products named by the advisory: 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; and 3 more.
Medium [CVE-2026-20104] Cisco IOS XE Software for Cisco Catalyst and Rugged Series Switches Secure Boot Bypass Vulnerability
A vulnerability in the bootloader of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches, Cisco Catalyst ESS9300 Embedded Series Switches, Cisco Catalyst IE9310 and IE9320 Rugged Series Switches, and Cisco IE3500 and IE3505 Rugged Series Switches could allow an authenticated, local attacker with level-15 privileges or an unauthenticated attacker with physical access to an affected device to execute arbitrary code at boot time and break the chain of trust. This vulnerability is due to insufficient validation of software at boot time. An attacker could exploit this vulnerability by … Affected products named by the advisory: Cisco IOS XE Software 16.12.8; Cisco IOS XE Software 16.12.6a; Cisco IOS XE Software 16.12.7; Cisco IOS XE Software 17.3.3; and 3 more.