CVE-2026-33790 (GCVE-0-2026-33790)

Vulnerability from cvelistv5 – Published: 2026-04-09 21:38 – Updated: 2026-04-10 13:56
VLAI?
Title
Junos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 packet will cause the srxpfe process to crash and restart.
Summary
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an attacker sending a specific, malformed ICMPv6 packet to cause the srxpfe process to crash and restart. Continued receipt and processing of these packets will repeatedly crash the srxpfe process and sustain the Denial of Service (DoS) condition. During NAT64 translation, receipt of a specific, malformed ICMPv6 packet destined to the device will cause the srxpfe process to crash and restart. This issue cannot be triggered using IPv4 nor other IPv6 traffic. This issue affects Junos OS on SRX Series: * all versions before 21.2R3-S10, * all versions of 21.3, * from 21.4 before 21.4R3-S12, * all versions of 22.1, * from 22.2 before 22.2R3-S8, * all versions of 22.4, * from 22.4 before 22.4R3-S9, * from 23.2 before 23.2R2-S6, * from 23.4 before 23.4R2-S7, * from 24.2 before 24.2R2-S3, * from 24.4 before 24.4R2-S3, * from 25.2 before 25.2R1-S2, 25.2R2.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 0 , < 21.2R3-S10 (semver)
Affected: 21.4 , < 21.4R3-S12 (semver)
Affected: 22.2 , < 22.2R3-S8 (semver)
Affected: 22.4 , < 22.4R3-S9 (semver)
Affected: 23.2 , < 23.2R2-S6 (semver)
Affected: 23.4 , < 23.4R2-S7 (semver)
Affected: 24.2 , < 24.2R2-S3 (semver)
Affected: 24.4 , < 24.4R2-S3 (semver)
Affected: 25.2 , < 25.2R1-S2, 25.2R2 (semver)
Affected: 21.3 , < 21.3* (semver)
Affected: 22.1 , < 22.1* (semver)
Affected: 22.3 , < 22.3* (semver)
Create a notification for this product.
Date Public ?
2026-04-08 16:00
Show details on NVD website
To clipboard 

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\"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"AUTOMATIC\", \"baseScore\": 8.7, \"Automatable\": \"YES\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"CONCENTRATED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber\", \"providerUrgency\": \"AMBER\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"LOW\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"MODERATE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Juniper Networks\", \"product\": \"Junos OS\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"21.2R3-S10\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"21.4\", \"lessThan\": \"21.4R3-S12\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"22.2\", \"lessThan\": \"22.2R3-S8\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"22.4\", \"lessThan\": \"22.4R3-S9\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"23.2\", \"lessThan\": \"23.2R2-S6\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"23.4\", \"lessThan\": \"23.4R2-S7\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"24.2\", \"lessThan\": \"24.2R2-S3\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"24.4\", \"lessThan\": \"24.4R2-S3\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"25.2\", \"lessThan\": \"25.2R1-S2, 25.2R2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"21.3\", \"lessThan\": \"21.3*\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"22.1\", \"lessThan\": \"22.1*\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"22.3\", \"lessThan\": \"22.3*\", \"versionType\": \"semver\"}], \"platforms\": [\"SRX Series\"], \"defaultStatus\": \"unaffected\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"base64\": false}]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"The following software releases have been updated to resolve this specific issue:\\n\\nJunos OS: 21.2R3-S10, 21.4R3-S12, 22.4R3-S9, 23.2R2-S6, 23.4R2-S7, 24.2R2-S3, 24.4R2-S3, 25.2R1-S2, 25.2R2, 25.4R1, and all subsequent releases.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The following software releases have been updated to resolve this specific issue:\u003cbr\u003e\u003cbr\u003eJunos OS: 21.2R3-S10, 21.4R3-S12, 22.4R3-S9, 23.2R2-S6, 23.4R2-S7, 24.2R2-S3, 24.4R2-S3, 25.2R1-S2, 25.2R2, 25.4R1, and all subsequent releases.\", \"base64\": false}]}], \"datePublic\": \"2026-04-08T16:00:00.000Z\", \"references\": [{\"url\": \"https://kb.juniper.net/JSA107874\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"There are no known workarounds for this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"There are no known workarounds for this issue.\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an attacker sending a specific, malformed ICMPv6 packet to cause the srxpfe process to crash and restart.\\u00a0Continued receipt and processing of these packets will repeatedly crash the srxpfe process and sustain the Denial of Service (DoS) condition.\\n\\nDuring NAT64 translation, receipt of a specific, malformed ICMPv6 packet destined to the device will cause the srxpfe process to crash and restart.\\n\\nThis issue cannot be triggered using IPv4 nor other IPv6 traffic.\\n\\n\\n\\nThis issue affects Junos OS on SRX Series:\\n  *  all versions before 21.2R3-S10,\\n  *  all versions of 21.3,\\n  *  from 21.4 before 21.4R3-S12,\\n  *  all versions of 22.1,\\n  *  from 22.2 before 22.2R3-S8,\\n  *  all versions of 22.4,\\n  *  from 22.4 before 22.4R3-S9,\\n  *  from 23.2 before 23.2R2-S6,\\n  *  from 23.4 before 23.4R2-S7,\\n  *  from 24.2 before 24.2R2-S3,\\n  *  from 24.4 before 24.4R2-S3,\\n  *  from 25.2 before 25.2R1-S2, 25.2R2.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an attacker sending a specific, malformed ICMPv6 packet to cause the srxpfe process to crash and restart.\u0026nbsp;Continued receipt and processing of these packets will repeatedly crash the srxpfe process and sustain the Denial of Service (DoS) condition.\u003cbr\u003e\u003cbr\u003eDuring NAT64 translation, receipt of a specific, malformed ICMPv6 packet destined to the device will cause the srxpfe process to crash and restart.\u003cbr\u003e\u003cbr\u003eThis issue cannot be triggered using IPv4 nor other IPv6 traffic.\u003cbr\u003e\\n\\n\u003cbr\u003eThis issue affects Junos OS on SRX Series:\u003cbr\u003e\u003cul\u003e\u003cli\u003eall versions before 21.2R3-S10,\u003c/li\u003e\u003cli\u003eall versions of 21.3,\u003c/li\u003e\u003cli\u003efrom 21.4 before 21.4R3-S12,\u003c/li\u003e\u003cli\u003eall versions of 22.1,\u003c/li\u003e\u003cli\u003efrom 22.2 before 22.2R3-S8,\u003c/li\u003e\u003cli\u003eall versions of 22.4,\u003c/li\u003e\u003cli\u003efrom 22.4 before 22.4R3-S9,\u003c/li\u003e\u003cli\u003efrom 23.2 before 23.2R2-S6,\u003c/li\u003e\u003cli\u003efrom 23.4 before 23.4R2-S7,\u003c/li\u003e\u003cli\u003efrom 24.2 before 24.2R2-S3,\u003c/li\u003e\u003cli\u003efrom 24.4 before 24.4R2-S3,\u003c/li\u003e\u003cli\u003efrom 25.2 before 25.2R1-S2, 25.2R2.\u003c/li\u003e\u003c/ul\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-754\", \"description\": \"CWE-754 Improper Check for Unusual or Exceptional Conditions\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"This issue requires a NAT IPv6 to IPv4 (NAT64) configuration to be present. For example:\\n\\n[ security nat source pool 1 address \u003cIPv4 address\u003e ]\\n[ security nat source rule-set 1 from zone \u003cprivate-zone\u003e ... ]\\n[ security nat source rule-set 1 to zone \u003cpublic-zone\u003e ... ]\\n[ security nat source rule-set 1 rule 1 match source-address \u003cIPv6 subnet\u003e ]\\n[ security nat source rule-set 1 rule 1 match destination-address 0.0.0.0/0 ]\\n[ security nat source rule-set 1 rule 1 then source-nat pool 1 ]\\n\\n[ set security nat static rule-set 1 from zone \u003cpvt-zone\u003e ]\\n[ set security nat static rule-set 1 rule 1 match destination-address \u003cdest IPv6 subnet / 96 \u003e ]\\n[ set security nat static rule-set 1 rule 1 then static-nat inet ]\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"This issue requires a NAT IPv6 to IPv4 (NAT64) configuration to be present. For example:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003e[ security nat source pool 1 address \u0026lt;IPv4 address\u0026gt; ]\u003cbr\u003e[ security nat source rule-set 1 from zone \u0026lt;private-zone\u0026gt; ... ]\u003cbr\u003e[ security nat source rule-set 1 to zone \u0026lt;public-zone\u0026gt; ... ]\u003cbr\u003e[ security nat source rule-set 1 rule 1 match source-address \u0026lt;IPv6 subnet\u0026gt; ]\u003cbr\u003e[ security nat source rule-set 1 rule 1 match destination-address 0.0.0.0/0 ]\u003cbr\u003e[ security nat source rule-set 1 rule 1 then source-nat pool 1 ]\u003cbr\u003e\u003cbr\u003e[ set security nat static rule-set 1 from zone \u0026lt;pvt-zone\u0026gt; ]\u003cbr\u003e[ set security nat static rule-set 1 rule 1 match destination-address \u0026lt;dest IPv6 subnet / 96 \u0026gt; ]\u003cbr\u003e[ set security nat static rule-set 1 rule 1 then static-nat inet ]\u003c/tt\u003e\u003cbr\u003e\u003cbr\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"shortName\": \"juniper\", \"dateUpdated\": \"2026-04-09T21:38:08.493Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-33790\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-10T13:56:16.375Z\", \"dateReserved\": \"2026-03-23T19:46:13.672Z\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"datePublished\": \"2026-04-09T21:38:08.493Z\", \"assignerShortName\": \"juniper\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.