CVE-2026-21920 (GCVE-0-2026-21920)

Vulnerability from cvelistv5 – Published: 2026-01-15 20:28 – Updated: 2026-01-15 20:59
VLAI?
Title
Junos OS: SRX Series: If a specific request is processed by the DNS subsystem flowd will crash
Summary
An Unchecked Return Value vulnerability in the DNS module of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). If an SRX Series device configured for DNS processing, receives a specifically formatted DNS request flowd will crash and restart, which causes a service interruption until the process has recovered. This issue affects Junos OS on SRX Series: * 23.4 versions before 23.4R2-S5, * 24.2 versions before 24.2R2-S1, * 24.4 versions before 24.4R2. This issue does not affect Junos OS versions before 23.4R1.
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/RE:M
CWE
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 23.4 , < 23.4R2-S5 (semver)
Affected: 24.2 , < 24.2R2-S1 (semver)
Affected: 24.4 , < 24.4R2 (semver)
Unaffected: 0 , < 23.4R1 (semver)
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unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).\u003c/span\u003e\u003cbr\u003e\\n\\n\u003cbr\u003e\u003cbr\u003eIf an SRX Series device configured for DNS processing, receives a specifically formatted DNS request flowd will crash and restart, which causes a service interruption until the process has recovered.\u003cbr\u003e\u003cbr\u003e\u003cp\u003eThis issue affects Junos OS on SRX Series:\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003e23.4 versions before 23.4R2-S5,\u003c/li\u003e\u003cli\u003e24.2 versions before 24.2R2-S1,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R2.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\\n\\n\u003cp\u003eThis issue does not affect Junos OS versions before 23.4R1.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-252\", \"description\": \"CWE-252 Unchecked Return Value\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"A device is exposed to this issue when one of the following features are used / configurations are present:\\n\\n- GeoIP:\\n\\n[ security dynamic-address address-name \u003cname\u003e profile category GeoIP ... ]\\n\\n\\n- DNS security:\\n\\n[\\u00a0services security-metadata-streaming policy \u003cname\u003e dns detections ... ]\\n\\nor\\n\\n[ services security-intelligence profile \u003cprofile-name\u003e category DNS ]\\n[ services security-intelligence profile policy \u003cpolicy-name\u003e DNS \u003cprofile-name\u003e ]\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eA device is exposed to this issue when one of the following features are used / configurations are present:\u003cbr\u003e\u003cbr\u003e- GeoIP:\u003cbr\u003e\u003c/span\u003e\u003ctt\u003e\u003ctt\u003e\u003ctt\u003e\u003c/tt\u003e\u003cbr\u003e\u003ctt\u003e\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003e[ security dynamic-address address-name \u0026lt;name\u0026gt; profile category GeoIP ... ]\u003cbr\u003e\u003c/span\u003e\u003c/tt\u003e\u003c/tt\u003e\u003c/tt\u003e\u003cbr\u003e\u003cbr\u003e- DNS security:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003e\u003ctt\u003e\u003ctt\u003e\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003e[\u0026nbsp;services security-metadata-streaming policy \u0026lt;name\u0026gt; dns detections ... ]\u003cbr\u003e\u003cbr\u003eor\u003cbr\u003e\u003cbr\u003e[ services security-intelligence profile \u0026lt;profile-name\u0026gt; category DNS ]\u003cbr\u003e[ services security-intelligence profile policy \u0026lt;policy-name\u0026gt; DNS \u0026lt;profile-name\u0026gt; ]\u003cbr\u003e\u003c/span\u003e\u003c/tt\u003e\u003ctt\u003e\u003ctt\u003e\u003ctt\u003e\u003cbr\u003e\u003ctt\u003e\\n\\n\u003c/tt\u003e\u003c/tt\u003e\u003c/tt\u003e\u003ctt\u003e\u003c/tt\u003e\u003ctt\u003e\u003c/tt\u003e\u003ctt\u003e\u003c/tt\u003e\u003ctt\u003e\u003c/tt\u003e\u003ctt\u003e\u003c/tt\u003e\u003ctt\u003e\u003c/tt\u003e\u003c/tt\u003e\u003c/tt\u003e\u003c/tt\u003e\u003ctt\u003e\u003c/tt\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"shortName\": \"juniper\", \"dateUpdated\": \"2026-01-15T20:28:10.526Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-21920\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-15T20:59:21.070Z\", \"dateReserved\": \"2026-01-05T17:32:48.712Z\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"datePublished\": \"2026-01-15T20:28:10.526Z\", \"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.