A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software, Cisco IOS Software, Cisco IOS XE Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause an affected device to reload. This vulnerability is due to improper input validation of the UDLD packets. An attacker could exploit this vulnerability by sending specifically crafted UDLD packets to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. An attacker must have full control of a directly connected device. On Cisco IOS XR devices, the impact is limited to the reload of the UDLD process.
CVSS Details
- CVSS 3.1 Base Score: 7.4
- CVSS 3.1 Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Cisco Ios | — | Upgrade to the latest version of Cisco IOS to resolve this vulnerability | Sep 23, 2021 | Sep 23, 2021 |
| Cisco Nx Os | — | Upgrade to the latest version of Cisco NX-OS to resolve this vulnerability. | Sep 23, 2021 | Sep 23, 2021 |
| Cisco Ucs_manager | — | Upgrade to the latest version of UCS Manager to resolve this vulnerability. | Sep 3, 2024 | Sep 22, 2021 |
| Cisco Xe | — | Upgrade to the latest version of Cisco IOS XE | Jan 18, 2022 | Sep 23, 2021 |
| Cisco Xr Os | — | Upgrade to the latest version of Cisco IOS-XR to resolve this vulnerability. | Oct 21, 2021 | Sep 23, 2021 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub