Vulnslist

find the latest Cisco vulnerabilities

Cisco FXOS and NX-OS Software Unidirectional Link Detection Denial of Service and Arbitrary Code Execution Vulnerability

cisco-sa-nxos-udld-rce-xetH6w35 · Medium · Published · Updated

A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted Cisco UDLD protocol packets to a directly connected, affected device. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the Cisco UDLD process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. The attacker needs full control of a directly connected device. That device must be connected over a port channel that has UDLD enabled. To trigger arbitrary code execution, both the UDLD-enabled port channel and specific system conditions must exist. In the absence of either the UDLD-enabled port channel or the system conditions, attempts to exploit this vulnerability will result in a DoS condition. It is possible, but highly unlikely, that an attacker could control the necessary conditions for exploitation. The CVSS score reflects this possibility. However, given the complexity of exploitation, Cisco has assigned a Medium Security Impact Rating (SIR) to this vulnerability. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-udld-rce-xetH6w35

Cisco advisory · CSAF JSON

Workarounds

There are no workarounds that address this vulnerability.

CVEsCVE-2021-1368
Cisco Bug IDsCSCvv78238, CSCvv96090, CSCvw38964, CSCvw45654, CSCvw38984, CSCvw38982, CSCvw38981, CSCvv96088, CSCvv96092, CSCvw38995, CSCvv96107, CSCvw38983
CVSS ScoreBase 8.8
Base 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco Unified Computing System (Managed), Cisco Firepower Extensible Operating System (FXOS), Cisco NX-OS Software 6.0(2)A8(1), Cisco NX-OS Software 6.0(2)A8(2), Cisco NX-OS Software 6.0(2)A8(3), Cisco NX-OS Software 6.0(2)A8(4), Cisco NX-OS Software 6.0(2)A8(4a), Cisco NX-OS Software 6.0(2)A8(5), Cisco NX-OS Software 6.0(2)A8(6), Cisco NX-OS Software 6.0(2)A8(7), Cisco NX-OS Software 6.0(2)A8(7a), Cisco NX-OS Software 6.0(2)A8(7b), Cisco NX-OS Software 6.0(2)A8(8), Cisco NX-OS Software 6.0(2)A8(9), Cisco NX-OS Software 6.0(2)A8(10a), Cisco NX-OS Software 6.0(2)A8(10), Cisco NX-OS Software 6.0(2)A8(11), Cisco NX-OS Software 6.0(2)A8(11a), Cisco NX-OS Software 6.0(2)A8(11b), Cisco NX-OS Software 7.0(3)F3(1), Cisco NX-OS Software 7.0(3)F3(2), Cisco NX-OS Software 7.0(3)F3(3), Cisco NX-OS Software 7.0(3)F3(3a), Cisco NX-OS Software 7.0(3)F3(4), Cisco NX-OS Software 7.0(3)F3(3c), Cisco NX-OS Software 7.0(3)F3(5), Cisco NX-OS Software 7.0(3)I4(1), Cisco NX-OS Software 7.0(3)I4(2), Cisco NX-OS Software 7.0(3)I4(3), Cisco NX-OS Software 7.0(3)I4(4), Cisco NX-OS Software 7.0(3)I4(5), Cisco NX-OS Software 7.0(3)I4(6), Cisco NX-OS Software 7.0(3)I4(7), Cisco NX-OS Software 7.0(3)I4(8), Cisco NX-OS Software 7.0(3)I4(8a), Cisco NX-OS Software 7.0(3)I4(8b), Cisco NX-OS Software 7.0(3)I4(8z), Cisco NX-OS Software 7.0(3)I4(1t), Cisco NX-OS Software 7.0(3)I4(6t), Cisco NX-OS Software 7.0(3)I4(9), Cisco NX-OS Software 7.0(3)I5(1), Cisco NX-OS Software 7.0(3)I5(2), Cisco NX-OS Software 7.0(3)I5(3), Cisco NX-OS Software 7.0(3)I5(3a), Cisco NX-OS Software 7.0(3)I5(3b), Cisco NX-OS Software 7.0(3)I6(1), Cisco NX-OS Software 7.0(3)I6(2), Cisco NX-OS Software 7.0(3)I7(1), Cisco NX-OS Software 7.0(3)I7(2), Cisco NX-OS Software 7.0(3)I7(3), Cisco NX-OS Software 7.0(3)I7(4), Cisco NX-OS Software 7.0(3)I7(5), Cisco NX-OS Software 7.0(3)I7(5a), Cisco NX-OS Software 7.0(3)I7(3z), Cisco NX-OS Software 7.0(3)I7(6), Cisco NX-OS Software 7.0(3)I7(6z), Cisco NX-OS Software 7.0(3)I7(7), Cisco NX-OS Software 7.0(3)I7(8), Cisco NX-OS Software 7.0(3)I7(9), Cisco NX-OS Software 7.0(3)I7(9w), Cisco NX-OS Software 7.3(0)D1(1), Cisco NX-OS Software 7.3(0)DX(1), Cisco NX-OS Software 7.3(0)DY(1), Cisco NX-OS Software 7.3(0)N1(1), Cisco NX-OS Software 7.3(0)N1(1b), Cisco NX-OS Software 7.3(0)N1(1a), Cisco NX-OS Software 7.3(1)D1(1), Cisco NX-OS Software 7.3(1)DY(1), Cisco NX-OS Software 7.3(1)N1(1), Cisco NX-OS Software 7.3(2)D1(1), Cisco NX-OS Software 7.3(2)D1(2), Cisco NX-OS Software 7.3(2)D1(3), Cisco NX-OS Software 7.3(2)D1(3a), Cisco NX-OS Software 7.3(2)D1(1d), Cisco NX-OS Software 7.3(2)N1(1), Cisco NX-OS Software 7.3(2)N1(1b), Cisco NX-OS Software 7.3(2)N1(1c), Cisco NX-OS Software 7.3(3)N1(1), Cisco NX-OS Software 8.1(1), Cisco NX-OS Software 8.1(2), Cisco NX-OS Software 8.1(2a), Cisco NX-OS Software 8.1(1a), Cisco NX-OS Software 8.1(1b), Cisco NX-OS Software 8.2(1), Cisco NX-OS Software 8.2(2), Cisco NX-OS Software 8.2(3), Cisco NX-OS Software 8.2(4), Cisco NX-OS Software 8.2(5), Cisco NX-OS Software 8.2(6), Cisco NX-OS Software 8.3(1), Cisco NX-OS Software 8.3(2), Cisco NX-OS Software 9.2(1), Cisco NX-OS Software 9.2(2), Cisco NX-OS Software 9.2(2t), Cisco NX-OS Software 9.2(3), Cisco NX-OS Software 9.2(3y), Cisco NX-OS Software 9.2(4), Cisco NX-OS Software 9.2(2v), Cisco NX-OS Software 7.3(4)N1(1), Cisco NX-OS Software 7.3(4)N1(1a), Cisco NX-OS Software 7.3(3)D1(1), Cisco NX-OS Software 7.0(3)IA7(1), Cisco NX-OS Software 7.0(3)IA7(2), Cisco NX-OS Software 7.0(3)IM7(2), Cisco NX-OS Software 7.3(4)D1(1), Cisco NX-OS Software 7.3(5)N1(1), Cisco NX-OS Software 8.4(1), Cisco NX-OS Software 8.4(1a), Cisco NX-OS Software 8.4(2), Cisco NX-OS Software 8.4(2a), Cisco NX-OS Software 8.4(3), Cisco NX-OS Software 8.4(2b), Cisco NX-OS Software 9.3(1), Cisco NX-OS Software 9.3(2), Cisco NX-OS Software 9.3(3), Cisco NX-OS Software 9.3(1z), Cisco NX-OS Software 9.3(4), Cisco NX-OS Software 9.3(5), Cisco NX-OS Software 9.3(5w), Cisco NX-OS Software 7.3(6)N1(1), Cisco NX-OS Software 7.3(6)N1(1a), Cisco NX-OS Software 7.3(5)D1(1), Cisco NX-OS Software 7.3(7)N1(1), Cisco NX-OS Software 7.3(7)N1(1a), Cisco NX-OS Software 7.3(7)N1(1b), Cisco NX-OS Software 7.3(6)D1(1), Cisco NX-OS Software 7.3(8)N1(1), Cisco NX-OS Software 7.3(8)N1(1a), Cisco NX-OS Software 7.3(8)N1(1b), Cisco NX-OS Software, Cisco MDS 9000 Multilayer Directors and Fabric Switches, Cisco Nexus 7000 Series Switches, Cisco Nexus 5000 Series Switches, Cisco Nexus 3000 Series Switches, Cisco Nexus 6000 Series Switches, Cisco Nexus 9000 Series Switches

Related Products

Product CVE Evidence
Firepower Extensible Operating System CVE-2021-1368 Cisco OpenVuln
Cisco Unified Computing System (Managed) CVE-2021-1368 Cisco OpenVuln
Cisco Nexus 9000 Series Switches CVE-2021-1368 Cisco OpenVuln
Cisco Nexus 7000 Series Switches CVE-2021-1368 Cisco OpenVuln
Cisco Nexus 6000 Series Switches CVE-2021-1368 Cisco OpenVuln
Cisco Nexus 5000 Series Switches CVE-2021-1368 Cisco OpenVuln
Cisco Nexus 3000 Series Switches CVE-2021-1368 Cisco OpenVuln
Cisco Nexus 3000 Series Switch CVE-2021-1368 Cisco OpenVuln
Cisco NX-OS Software CVE-2021-1368 Cisco OpenVuln
Cisco MDS 9000 Multilayer Directors and Fabric Switches CVE-2021-1368 Cisco OpenVuln
Cisco Firepower Extensible Operating System (FXOS) CVE-2021-1368 Cisco OpenVuln
Cisco Firepower Extensible Operating System CVE-2021-1368 Cisco OpenVuln