The vulnerability of the Unidirectional Link Detection function in operating systems such as NX-OS, FXOS, Cisco IOS XE, and Cisco IOS XR arises from insufficient input data validation. This allows attackers to trigger service interruptions.

Unidirectional Link Detection is vulnerable on NX-OS, FXOS, IOS XE, IOS XR due to input validation flaws.

Reporter	Title	Published	Views	Family All 11
Cisco	Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability	22 Sep 202116:00	–	cisco
CNNVD	多款Cisco产品输入验证错误漏洞	22 Sep 202100:00	–	cnnvd
CVE	CVE-2021-34714	23 Sep 202102:25	–	cve
Cvelist	CVE-2021-34714 Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability	23 Sep 202102:25	–	cvelist
EUVD	EUVD-2021-21364	7 Oct 202500:30	–	euvd
NCSC	Vulnerabilities fixed in Cisco products	23 Sep 202100:00	–	ncsc
NVD	CVE-2021-34714	23 Sep 202103:15	–	nvd
Prion	Input validation	23 Sep 202103:15	–	prion
Positive Technologies	PT-2021-4497 · Cisco · Cisco Fxos +5	22 Sep 202100:00	–	ptsecurity
Tenable Nessus	Cisco Multiple Operating Systems Unidirectional Link Detection Denial of Service (CVE-2021-34714)	25 Jul 202300:00	–	nessus