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CVE-2026-57023 Junos OS: MX with SPC3, SRX Series: A specifically malformed TCP packet causes a flowd crash

🗓️ 09 Jul 2026 21:06:34Reported by juniperType 
cvelist
 cvelist
🔗 www.cve.org👁 7 Views

Malformed header in the proxy crashes the flowd on Junos OS devices in MX and SRX series, causing service outage.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-57023
9 Jul 202621:06
attackerkb
Circl
CVE-2026-57023
9 Jul 202604:47
circl
CVE
CVE-2026-57023
9 Jul 202621:06
cve
EUVD
EUVD-2026-42711
10 Jul 202600:31
euvd
Tenable Nessus
Juniper Junos OS Vulnerability (JSA110083)
8 Jul 202600:00
nessus
NVD
CVE-2026-57023
9 Jul 202622:17
nvd
Positive Technologies
PT-2026-56977
9 Jul 202600:00
ptsecurity
[
  {
    "defaultStatus": "unaffected",
    "platforms": [
      "SRX Series",
      "MX Series with SPC3"
    ],
    "product": "Junos OS",
    "vendor": "Juniper Networks",
    "versions": [
      {
        "lessThan": "23.4R2-S7",
        "status": "affected",
        "version": "23.4",
        "versionType": "custom"
      },
      {
        "lessThan": "24.2R2-S4",
        "status": "affected",
        "version": "24.2",
        "versionType": "custom"
      },
      {
        "lessThan": "24.4R2-S3",
        "status": "affected",
        "version": "24.4",
        "versionType": "custom"
      },
      {
        "lessThan": "25.2R2",
        "status": "affected",
        "version": "25.2",
        "versionType": "custom"
      }
    ]
  }
]

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