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CVE-2026-21910 Junos OS: EX4k Series, QFX5k Series: In an EVPN-VXLAN configuration link flaps cause Inter-VNI traffic drop

🗓️ 15 Jan 2026 20:23:29Reported by juniperType 
cvelist
 cvelist
🔗 www.cve.org👁 23 Views

Unauthenticated attacker can flap EVPN-VXLAN LAG to drop Inter-VNI traffic on EX4k/QFX5k Junos.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-21910
15 Jan 202620:23
attackerkb
Circl
CVE-2026-21910
15 Jan 202621:55
circl
CNNVD
Juniper Networks Junos OS code-related vulnerabilities
15 Jan 202600:00
cnnvd
CVE
CVE-2026-21910
15 Jan 202620:23
cve
EUVD
EUVD-2026-2694
15 Jan 202620:23
euvd
NCSC
Vulnerabilities fixed in Juniper Networks JunOS
16 Jan 202610:07
ncsc
NVD
CVE-2026-21910
15 Jan 202621:16
nvd
OSV
CVE-2026-21910
15 Jan 202621:16
osv
Positive Technologies
PT-2026-3124
15 Jan 202600:00
ptsecurity
RedhatCVE
CVE-2026-21910
16 Jan 202621:33
redhatcve
Rows per page
[
  {
    "defaultStatus": "unaffected",
    "platforms": [
      "EX4k Series",
      "QFX5k Series"
    ],
    "product": "Junos OS",
    "vendor": "Juniper Networks",
    "versions": [
      {
        "lessThan": "21.4R3-S12",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      },
      {
        "lessThan": "22.2*",
        "status": "affected",
        "version": "22.2",
        "versionType": "semver"
      },
      {
        "lessThan": "22.4R3-S8",
        "status": "affected",
        "version": "22.4",
        "versionType": "semver"
      },
      {
        "lessThan": "23.2R2-S5",
        "status": "affected",
        "version": "23.2",
        "versionType": "semver"
      },
      {
        "lessThan": "23.4R2-S5",
        "status": "affected",
        "version": "23.4",
        "versionType": "semver"
      },
      {
        "lessThan": "24.2R2-S3",
        "status": "affected",
        "version": "24.2",
        "versionType": "semver"
      },
      {
        "lessThan": "24.4R2",
        "status": "affected",
        "version": "24.4",
        "versionType": "semver"
      }
    ]
  }
]

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