CVE-2021-34714

🗓️ 23 Sep 2021 02:25:58Reported by ciscoType

A vulnerability in the UDLD feature of Cisco Software could allow adjacent attacker to cause device reload

Reporter	Title	Published	Views	Family All 14
attackerkb	CVE-2021-34714	22 Sep 202116:00	–	attackerkb
BDU FSTEC	Unidirectional Link Detection DoS	27 Oct 202100:00	–	bdu_fstec
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
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
osv_cve	CVE-2021-34714	23 Sep 202103:15	–	osv_cve
Prion	Input validation	23 Sep 202103:15	–	prion

NVD

Node

AND

cisco fxosRange2.2–2.2.2.148

cisco fxosRange2.3–2.3.1.216

cisco fxosRange2.4–2.4.1.273

cisco fxosRange2.6–2.6.1.224

cisco fxosRange2.7–2.7.1.143

cisco fxosRange2.8–2.8.1.143

cisco fxosRange2.9–2.9.1.135

cisco firepower_4100Match-

cisco firepower_4110Match-

cisco firepower_4112Match-

cisco firepower_4115Match-

cisco firepower_4120Match-

cisco firepower_4125Match-

cisco firepower_4140Match-

cisco firepower_4145Match-

cisco firepower_4150Match-

cisco firepower_9300Match-

cisco firepower_9300_sm-24Match-

cisco firepower_9300_sm-36Match-

cisco firepower_9300_sm-40Match-

cisco firepower_9300_sm-44Match-

cisco firepower_9300_sm-44_x_3Match-

cisco firepower_9300_sm-48Match-

cisco firepower_9300_sm-56Match-

cisco firepower_9300_sm-56_x_3Match-

cisco firepower_9300_with_1_sm-24_moduleMatch-

cisco firepower_9300_with_1_sm-36_moduleMatch-

cisco firepower_9300_with_1_sm-44_moduleMatch-

cisco firepower_9300_with_3_sm-44_moduleMatch-

Node

AND

cisco firepower_extensible_operating_systemRange≤8.4(3.115)

cisco iosRange≤8.4(3.115)

cisco ios_xeRange≤8.4(3.115)

cisco ios_xrRange≤8.4(3.115)

cisco nx-osRange≤8.4(3.115)

cisco mds_9000Match-

cisco mds_9100Match-

cisco mds_9132tMatch-

cisco mds_9134Match-

cisco mds_9140Match-

cisco mds_9148Match-

cisco mds_9148sMatch-

cisco mds_9148tMatch-

cisco mds_9200Match-

cisco mds_9216Match-

cisco mds_9216aMatch-

cisco mds_9216iMatch-

cisco mds_9222iMatch-

cisco mds_9250iMatch-

cisco mds_9396sMatch-

cisco mds_9396tMatch-

cisco mds_9500Match-

cisco mds_9506Match-

cisco mds_9509Match-

cisco mds_9513Match-

cisco mds_9700Match-

cisco mds_9706Match-

cisco mds_9710Match-

cisco mds_9718Match-

cisco nexus_7000Match-

cisco nexus_7000_10-slotMatch-

cisco nexus_7000_18-slotMatch-

cisco nexus_7000_4-slotMatch-

cisco nexus_7000_9-slotMatch-

cisco nexus_7000_supervisor_1Match-

cisco nexus_7000_supervisor_2Match-

cisco nexus_7000_supervisor_2eMatch-

cisco nexus_7004Match-

cisco nexus_7009Match-

cisco nexus_7010Match-

cisco nexus_7018Match-

cisco nexus_7700Match-

cisco nexus_7700_10-slotMatch-

cisco nexus_7700_18-slotMatch-

cisco nexus_7700_2-slotMatch-

cisco nexus_7700_6-slotMatch-

cisco nexus_7700_supervisor_2eMatch-

cisco nexus_7700_supervisor_3eMatch-

cisco nexus_7702Match-

cisco nexus_7706Match-

cisco nexus_7710Match-

cisco nexus_7718Match-

Node

AND

cisco firepower_extensible_operating_systemRange≤7.0(3)i7(9)

cisco iosRange≤7.0(3)i7(9)

cisco ios_xeRange≤7.0(3)i7(9)

cisco ios_xrRange≤7.0(3)i7(9)

cisco nx-osRange≤7.0(3)i7(9)

cisco nexus_3000Match-

cisco nexus_3016Match-

cisco nexus_3016qMatch-

cisco nexus_3048Match-

cisco nexus_3064Match-

cisco nexus_3064-32tMatch-

cisco nexus_3064-tMatch-

cisco nexus_3064-xMatch-

cisco nexus_3064tMatch-

cisco nexus_3064xMatch-

cisco nexus_3100Match-

cisco nexus_3100-vMatch-

cisco nexus_3100-zMatch-

cisco nexus_3100vMatch-

cisco nexus_31108pc-vMatch-

cisco nexus_31108pv-vMatch-

cisco nexus_31108tc-vMatch-

cisco nexus_31128pqMatch-

cisco nexus_3132c-zMatch-

cisco nexus_3132qMatch-

cisco nexus_3132q-vMatch-

cisco nexus_3132q-xMatch-

cisco nexus_3132q-x/3132q-xlMatch-

cisco nexus_3132q-xlMatch-

cisco nexus_3164qMatch-

cisco nexus_3172Match-

cisco nexus_3172pqMatch-

cisco nexus_3172pq-xlMatch-

cisco nexus_3172pq/pq-xlMatch-

cisco nexus_3172tqMatch-

cisco nexus_3172tq-32tMatch-

cisco nexus_3172tq-xlMatch-

cisco nexus_3200Match-

cisco nexus_3232cMatch-

cisco nexus_3232c_Match-

cisco nexus_3264c-eMatch-

cisco nexus_3264qMatch-

cisco nexus_3400Match-

cisco nexus_3408-sMatch-

cisco nexus_34180ycMatch-

cisco nexus_34200yc-smMatch-

cisco nexus_3432d-sMatch-

cisco nexus_3464cMatch-

cisco nexus_3500Match-

cisco nexus_3500_platformMatch-

cisco nexus_3524Match-

cisco nexus_3524-xMatch-

cisco nexus_3524-x/xlMatch-

cisco nexus_3524-xlMatch-

cisco nexus_3548Match-

cisco nexus_3548-xMatch-

cisco nexus_3548-x/xlMatch-

cisco nexus_3548-xlMatch-

cisco nexus_3600Match-

cisco nexus_36180yc-rMatch-

cisco nexus_3636c-rMatch-

cisco nexus_9000Match-

cisco nexus_9000_in_aci_modeMatch-

cisco nexus_9000_in_standaloneMatch-

cisco nexus_9000_in_standalone_nx-os_modeMatch-

cisco nexus_9000vMatch-

cisco nexus_9200Match-

cisco nexus_92160yc-xMatch-

cisco nexus_9221cMatch-

cisco nexus_92300ycMatch-

cisco nexus_92304qcMatch-

cisco nexus_92348gc-xMatch-

cisco nexus_9236cMatch-

cisco nexus_9272qMatch-

cisco nexus_9300Match-

cisco nexus_93108tc-exMatch-

cisco nexus_93108tc-ex-24Match-

cisco nexus_93108tc-fxMatch-

cisco nexus_93108tc-fx-24Match-

cisco nexus_93108tc-fx3pMatch-

cisco nexus_93120txMatch-

cisco nexus_93128Match-

cisco nexus_93128txMatch-

cisco nexus_9316d-gxMatch-

cisco nexus_93180lc-exMatch-

cisco nexus_93180tc-exMatch-

cisco nexus_93180yc-exMatch-

cisco nexus_93180yc-ex-24Match-

cisco nexus_93180yc-fxMatch-

cisco nexus_93180yc-fx-24Match-

cisco nexus_93180yc-fx3Match-

cisco nexus_93180yc-fx3sMatch-

cisco nexus_93216tc-fx2Match-

cisco nexus_93240yc-fx2Match-

cisco nexus_9332cMatch-

cisco nexus_9332pqMatch-

cisco nexus_93360yc-fx2Match-

cisco nexus_9336c-fx2Match-

cisco nexus_9336c-fx2-eMatch-

cisco nexus_9336pqMatch-

cisco nexus_9336pq_aci_spineMatch-

cisco nexus_9348gc-fxpMatch-

cisco nexus_93600cd-gxMatch-

cisco nexus_9364cMatch-

cisco nexus_9364c-gxMatch-

cisco nexus_9372pxMatch-

cisco nexus_9372px-eMatch-

cisco nexus_9372txMatch-

cisco nexus_9372tx-eMatch-

cisco nexus_9396pxMatch-

cisco nexus_9396txMatch-

cisco nexus_9500Match-

cisco nexus_9500_supervisor_aMatch-

cisco nexus_9500_supervisor_a+Match-

cisco nexus_9500_supervisor_bMatch-

cisco nexus_9500_supervisor_b+Match-

cisco nexus_9500rMatch-

cisco nexus_9504Match-

cisco nexus_9508Match-

cisco nexus_9516Match-

Node

AND

cisco firepower_extensible_operating_systemRange≤7.3(8)n1(1)

cisco iosRange≤7.3(8)n1(1)

cisco ios_xeRange≤7.3(8)n1(1)

cisco ios_xrRange≤7.3(8)n1(1)

cisco nx-osRange≤7.3(8)n1(1)

cisco nexus_5000Match-

cisco nexus_5010Match-

cisco nexus_5020Match-

cisco nexus_5500Match-

cisco nexus_5548pMatch-

cisco nexus_5548upMatch-

cisco nexus_5596tMatch-

cisco nexus_5596upMatch-

cisco nexus_5600Match-

cisco nexus_56128pMatch-

cisco nexus_5624qMatch-

cisco nexus_5648qMatch-

cisco nexus_5672upMatch-

cisco nexus_5672up-16gMatch-

cisco nexus_5696qMatch-

cisco nexus_6000Match-

cisco nexus_6001Match-

cisco nexus_6001pMatch-

cisco nexus_6001tMatch-

cisco nexus_6004Match-

cisco nexus_6004xMatch-

Node

AND

cisco firepower_extensible_operating_systemRange≤3.2(3o)a

cisco iosRange≤3.2(3o)a

cisco ios_xeRange≤3.2(3o)a

cisco ios_xrRange≤3.2(3o)a

cisco nx-osRange≤3.2(3o)a

cisco ucs_6200Match-

cisco ucs_6248_up_fabric_interconnectMatch-

cisco ucs_6248upMatch-

cisco ucs_6296_up_fabric_interconnectMatch-

cisco ucs_6296upMatch-

cisco ucs_6300Match-

cisco ucs_6324Match-

cisco ucs_6324_fabric_interconnectMatch-

cisco ucs_6332Match-

cisco ucs_6332-16upMatch-

cisco ucs_6332-16up_fabric_interconnectMatch-

cisco ucs_6332_fabric_interconnectMatch-

Node

AND

cisco firepower_extensible_operating_systemRange≤4.1(1a)a

cisco iosRange≤4.1(1a)a

cisco ios_xeRange≤4.1(1a)a

cisco ios_xrRange≤4.1(1a)a

cisco nx-osRange≤3.2(3o)a

cisco ucs_6400Match-

cisco ucs_6454Match-

[
  {
    "product": "Cisco IOS",
    "vendor": "Cisco",
    "versions": [
      {
        "status": "affected",
        "version": "n/a"
      }
    ]
  }
]

Source	Link
tools	www.tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ

17 Jun 2026 03:56Current

7.4High risk

Vulners AI Score7.4

CVSS 25.7

CVSS 3.17.4

EPSS0.00389

SSVC

CWE-20