Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability (Cisco Cisco IOS)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.39 % · percentile 33 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- cisco
- NVD status
- Modified
Description
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.
Weaknesses (CWE)
- CWE-20 — Improper Input Validation
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H | cisco |
| CVSS 3.1 | HIGH 7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H | NVD · psirt@cisco.com (Secondary) |
| CVSS 3.1 | HIGH 7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
| CVSS 2.0 | MEDIUM 5.7 | AV:A/AC:M/Au:N/C:N/I:N/A:C | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2021-21364
- GCVE · GCVE-0-2021-34714
Affected configurations (NVD CPE)
cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*≥ 2.2 < 2.2.2.148cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*≥ 2.3 < 2.3.1.216cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*≥ 2.4 < 2.4.1.273cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*≥ 2.6 < 2.6.1.224cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*≥ 2.7 < 2.7.1.143cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*≥ 2.8 < 2.8.1.143cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*≥ 2.9 < 2.9.1.135cpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*≤ 8.4\(3.115\)cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*≤ 8.4\(3.115\)cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*≤ 8.4\(3.115\)cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*≤ 8.4\(3.115\)cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*≤ 8.4\(3.115\)cpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*≤ 7.0\(3\)i7\(9\)cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*≤ 7.0\(3\)i7\(9\)cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*≤ 7.0\(3\)i7\(9\)cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*≤ 7.0\(3\)i7\(9\)cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*≤ 7.0\(3\)i7\(9\)cpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*≤ 7.3\(8\)n1\(1\)cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*≤ 7.3\(8\)n1\(1\)cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*≤ 7.3\(8\)n1\(1\)cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*≤ 7.3\(8\)n1\(1\)cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*≤ 7.3\(8\)n1\(1\)cpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*≤ 3.2\(3o\)acpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*≤ 3.2\(3o\)acpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*≤ 3.2\(3o\)acpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*≤ 3.2\(3o\)acpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*≤ 3.2\(3o\)acpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*≤ 4.1\(1a\)acpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*≤ 4.1\(1a\)acpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*≤ 4.1\(1a\)acpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*≤ 4.1\(1a\)acpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*≤ 3.2\(3o\)a
Affected products
| Product | Versions |
|---|---|
| Cisco · Cisco IOS | affected n/a |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |