Vulnerability Details : CVE-2021-34714
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.
Vulnerability category: Input validationDenial of service
Products affected by CVE-2021-34714
- cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:firepower_extensible_operating_system:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fxos:*:*:*:*:*:*:*:*
Max 200 conditions are displayed on this page, to prevent potential performance issues,
please refer to NVD for more details.
Exploit prediction scoring system (EPSS) score for CVE-2021-34714
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 25 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-34714
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.7
|
MEDIUM | AV:A/AC:M/Au:N/C:N/I:N/A:C |
5.5
|
6.9
|
NIST | |
7.4
|
HIGH | CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
2.8
|
4.0
|
Cisco Systems, Inc. | |
7.4
|
HIGH | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
2.8
|
4.0
|
NIST |
CWE ids for CVE-2021-34714
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)
References for CVE-2021-34714
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ
Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service VulnerabilityVendor Advisory
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