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CVE-2026-21909

🗓️ 15 Jan 2026 20:22:44Reported by juniperType 
cve
 cve
🔗 web.nvd.nist.gov👁 13 Views

Unauthenticated adjacent IS-IS update packet causes memory leak in rpd and DoS.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-21909
15 Jan 202620:22
attackerkb
Circl
CVE-2026-21909
15 Jan 202621:42
circl
CNNVD
Juniper Networks Junos OS and Juniper Networks Junos OS Evolved security vulnerabilities
15 Jan 202600:00
cnnvd
Cvelist
CVE-2026-21909 Junos OS and Junos OS Evolved: Receipt of specific IS-IS update packet causes memory leak leading to RPD crash
15 Jan 202620:22
cvelist
EUVD
EUVD-2026-2696
15 Jan 202620:22
euvd
NCSC
Vulnerabilities fixed in Juniper Networks JunOS
16 Jan 202610:07
ncsc
NVD
CVE-2026-21909
15 Jan 202621:16
nvd
OSV
CVE-2026-21909
15 Jan 202621:16
osv
Positive Technologies
PT-2026-3123
15 Jan 202600:00
ptsecurity
RedhatCVE
CVE-2026-21909
16 Jan 202621:33
redhatcve
Rows per page
NVD
Vulners
Node
juniperjunosMatch23.2-
OR
juniperjunosMatch23.2r1
OR
juniperjunosMatch23.2r1-s1
OR
juniperjunosMatch23.2r1-s2
OR
juniperjunosMatch23.4-
OR
juniperjunosMatch23.4r1
OR
juniperjunosMatch23.4r1-s1
OR
juniperjunosMatch23.4r2
OR
juniperjunosMatch24.1-
OR
juniperjunosMatch24.1r1
OROROROROROROROROROR
[
  {
    "defaultStatus": "unaffected",
    "product": "Junos OS",
    "vendor": "Juniper Networks",
    "versions": [
      {
        "lessThan": "23.2R2",
        "status": "affected",
        "version": "23.2",
        "versionType": "semver"
      },
      {
        "lessThan": "23.4R1-S2, 23.4R2",
        "status": "affected",
        "version": "23.4",
        "versionType": "semver"
      },
      {
        "lessThan": "24.1R2",
        "status": "affected",
        "version": "24.1",
        "versionType": "semver"
      },
      {
        "lessThan": "23.2R1",
        "status": "unaffected",
        "version": "0",
        "versionType": "semver"
      }
    ]
  },
  {
    "defaultStatus": "unaffected",
    "product": "Junos OS Evolved",
    "vendor": "Juniper Networks",
    "versions": [
      {
        "lessThan": "23.2R2-EVO",
        "status": "affected",
        "version": "23.2",
        "versionType": "semver"
      },
      {
        "lessThan": "23.4R1-S2-EVO, 23.4R2-EVO",
        "status": "affected",
        "version": "23.4",
        "versionType": "semver"
      },
      {
        "lessThan": "24.1R2-EVO",
        "status": "affected",
        "version": "24.1",
        "versionType": "semver"
      },
      {
        "lessThan": "23.2R1-EVO",
        "status": "unaffected",
        "version": "0",
        "versionType": "semver"
      }
    ]
  }
]

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17 Jun 2026 10:19Current
6.7Medium risk
Vulners AI Score6.7
CVSS 3.16.5
CVSS 47.1
EPSS0.00235
SSVC
13