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CVE-2026-21920

🗓️ 15 Jan 2026 20:28:10Reported by juniperType 
cve
 cve
🔗 web.nvd.nist.gov👁 5 Views

Unauthenticated attacker can crash DNS flowd on SRX by a specific DNS request, causing DoS.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-21920
15 Jan 202620:28
attackerkb
Circl
CVE-2026-21920
15 Jan 202621:54
circl
CNNVD
Juniper Networks Junos OS security vulnerabilities
15 Jan 202600:00
cnnvd
Cvelist
CVE-2026-21920 Junos OS: SRX Series: If a specific request is processed by the DNS subsystem flowd will crash
15 Jan 202620:28
cvelist
EUVD
EUVD-2026-2685
15 Jan 202620:28
euvd
Tenable Nessus
Juniper Junos OS Vulnerability (JSA106020)
14 Jan 202600:00
nessus
NCSC
Vulnerabilities fixed in Juniper Networks JunOS
16 Jan 202610:07
ncsc
NVD
CVE-2026-21920
15 Jan 202621:16
nvd
Positive Technologies
PT-2026-3131
15 Jan 202600:00
ptsecurity
RedhatCVE
CVE-2026-21920
16 Jan 202621:33
redhatcve
Rows per page
NVD
Vulners
Node
juniperjunosMatch23.4-
OR
juniperjunosMatch23.4r1
OR
juniperjunosMatch23.4r1-s1
OR
juniperjunosMatch23.4r1-s2
OR
juniperjunosMatch23.4r2
OR
juniperjunosMatch23.4r2-s1
OR
juniperjunosMatch23.4r2-s2
OR
juniperjunosMatch23.4r2-s3
OR
juniperjunosMatch23.4r2-s4
OR
juniperjunosMatch24.2-
OR
juniperjunosMatch24.2r1
OR
juniperjunosMatch24.2r1-s1
OR
juniperjunosMatch24.2r1-s2
OR
juniperjunosMatch24.2r2
OR
juniperjunosMatch24.4-
OR
juniperjunosMatch24.4r1
OR
juniperjunosMatch24.4r1-s2
OR
juniperjunosMatch24.4r1-s3
AND
[
  {
    "defaultStatus": "unaffected",
    "platforms": [
      "SRX Series"
    ],
    "product": "Junos OS",
    "vendor": "Juniper Networks",
    "versions": [
      {
        "lessThan": "23.4R2-S5",
        "status": "affected",
        "version": "23.4",
        "versionType": "semver"
      },
      {
        "lessThan": "24.2R2-S1",
        "status": "affected",
        "version": "24.2",
        "versionType": "semver"
      },
      {
        "lessThan": "24.4R2",
        "status": "affected",
        "version": "24.4",
        "versionType": "semver"
      },
      {
        "lessThan": "23.4R1",
        "status": "unaffected",
        "version": "0",
        "versionType": "semver"
      }
    ]
  }
]

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23 Jan 2026 18:51Current
6.5Medium risk
Vulners AI Score6.5
CVSS 3.17.5
CVSS 48.7
EPSS0.00021
SSVC
5