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CVE-2026-21912 Junos OS: MX10k Series: 'show system firmware' CLI command may lead to LC480 or LC2101 line card reset

🗓️ 15 Jan 2026 20:24:20Reported by juniperType 
cvelist
 cvelist
🔗 www.cve.org👁 23 Views

TOCTOU race in MX10k Junos OS show system firmware enables local attacker to reset LC480 or LC2101 cards.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-21912
15 Jan 202620:24
attackerkb
Circl
CVE-2026-21912
15 Jan 202622:32
circl
CNNVD
Juniper Networks Junos OS security vulnerabilities
15 Jan 202600:00
cnnvd
CVE
CVE-2026-21912
15 Jan 202620:24
cve
EUVD
EUVD-2026-2682
15 Jan 202620:24
euvd
NCSC
Vulnerabilities fixed in Juniper Networks JunOS
16 Jan 202610:07
ncsc
NVD
CVE-2026-21912
15 Jan 202621:16
nvd
OSV
CVE-2026-21912
15 Jan 202621:16
osv
Positive Technologies
PT-2026-3126
15 Jan 202600:00
ptsecurity
RedhatCVE
CVE-2026-21912
16 Jan 202621:33
redhatcve
Rows per page
[
  {
    "defaultStatus": "unaffected",
    "platforms": [
      "MX10k Series"
    ],
    "product": "Junos OS",
    "vendor": "Juniper Networks",
    "versions": [
      {
        "lessThan": "21.2R3-S10",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      },
      {
        "lessThan": "21.4R3-S9",
        "status": "affected",
        "version": "21.4",
        "versionType": "semver"
      },
      {
        "lessThan": "22.2R3-S7",
        "status": "affected",
        "version": "22.2",
        "versionType": "semver"
      },
      {
        "lessThan": "22.4R3-S6",
        "status": "affected",
        "version": "22.4",
        "versionType": "semver"
      },
      {
        "lessThan": "23.2R2-S2",
        "status": "affected",
        "version": "23.2",
        "versionType": "semver"
      },
      {
        "lessThan": "23.4R2-S3",
        "status": "affected",
        "version": "23.4",
        "versionType": "semver"
      },
      {
        "lessThan": "24.2R2",
        "status": "affected",
        "version": "24.2",
        "versionType": "semver"
      }
    ]
  }
]

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15 Jan 2026 20:24Current
CVSS 3.15.5
CVSS 46.8
EPSS0.00103
23