CVE-2026-57030 (GCVE-0-2026-57030)

Vulnerability from cvelistv5 – Published: 2026-07-09 21:13 – Updated: 2026-07-09 21:13
VLAI
Title
Junos OS: SRX Series: Flow sessions are not getting cleared leading to a DoS
Summary
A Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). As part of the stateful traffic processing on SRX Series devices flows are being established, and removed when not needed anymore. During the removal process the timeout of a flow should be set to 3 seconds and consequentially the flow should be removed shortly after. Due to a race condition occurring when setting the timeout there is a chance (the exact conditions are outside the attackers control) that the timeout is instead set to a very high value of larger than 10,000 seconds: user@host> show security flow session | match timeout Session ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid This will lead to an accumulation of flows which can be observed by an ever-increasing value of invalidated sessions in the output of 'show security flow session summary': user@host> show security flow session summary | match invalid Invalidated sessions: 216931These sessions can't be cleared manually with the 'clear security flow session' command, which will either lead to forwarding to stop (and the system needs to be manually recovered with a reboot) or to a flowd core and automatic reboot. This issue affects Junos OS on SRX Series: * 24.2 versions before 24.2R2-S3, * 24.4 versions before 24.4R2-S1, 24.4R2-S2, * 25.2 versions before 25.2R1-S2, 25.2R2. This issue does not affect releases earlier than 24.2R1;
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:M
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 24.2 , < 24.2R2-S3 (custom)
Affected: 24.4 , < 24.4R2-S1 (custom)
Affected: 25.2 , < 25.2R1-S2 (custom)
Unaffected: 0 , < 24.2R1 (custom)
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Date Public
2026-07-08 16:00
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              "value": "A Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027) vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).\u003cbr\u003e\u003cbr\u003eAs part of the stateful traffic processing on SRX Series devices flows are being established, and removed when not needed anymore. During the removal process the timeout of a flow should be set to 3 seconds and consequentially the flow should be removed shortly after. Due to a race condition occurring when setting the timeout there is a chance (the exact conditions are outside the attackers control) that the timeout is instead set to a very high value of larger than 10,000 seconds:\u003cbr\u003e\u003cbr\u003e\n\n\u003ctt\u003euser@host\u0026gt; show security flow session | match timeout\u003cbr\u003eSession ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid\u003c/tt\u003e\u003cbr\u003e\u003cbr\u003eThis will lead to an accumulation of flows which can be observed by an ever-increasing value of invalidated sessions in the output of \u0027show security flow session summary\u0027:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003euser@host\u0026gt; show security flow session summary | match invalid\u003cbr\u003eInvalidated sessions: 216931\u003c/tt\u003e\u003cp\u003eThese sessions can\u0027t be cleared manually with the \u0027clear security flow session\u0027 command, which will either lead to forwarding to stop (and the system needs to be manually recovered with a reboot) or to a flowd core and automatic reboot.\u003c/p\u003e\u003cp\u003e\u003cbr\u003eThis issue affects Junos OS on SRX Series:\u003cbr\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003e24.2 versions before 24.2R2-S3,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R2-S1, 24.4R2-S2,\u003c/li\u003e\u003cli\u003e25.2\u0026nbsp;versions\u0026nbsp;before 25.2R1-S2, 25.2R2.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003eThis issue does not affect releases earlier than 24.2R1;\u003c/p\u003e"
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          "value": "A Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027) vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).\n\nAs part of the stateful traffic processing on SRX Series devices flows are being established, and removed when not needed anymore. During the removal process the timeout of a flow should be set to 3 seconds and consequentially the flow should be removed shortly after. Due to a race condition occurring when setting the timeout there is a chance (the exact conditions are outside the attackers control) that the timeout is instead set to a very high value of larger than 10,000 seconds:\n\n\n\nuser@host\u003e show security flow session | match timeout\nSession ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid\n\nThis will lead to an accumulation of flows which can be observed by an ever-increasing value of invalidated sessions in the output of \u0027show security flow session summary\u0027:\n\nuser@host\u003e show security flow session summary | match invalid\nInvalidated sessions: 216931These sessions can\u0027t be cleared manually with the \u0027clear security flow session\u0027 command, which will either lead to forwarding to stop (and the system needs to be manually recovered with a reboot) or to a flowd core and automatic reboot.\n\n\nThis issue affects Junos OS on SRX Series:\n\n\n  *  24.2 versions before 24.2R2-S3,\n  *  24.4 versions before 24.4R2-S1, 24.4R2-S2,\n  *  25.2\u00a0versions\u00a0before 25.2R1-S2, 25.2R2.\n\n\n\n\nThis issue does not affect releases earlier than 24.2R1;"
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Due to a race condition occurring when setting the timeout there is a chance (the exact conditions are outside the attackers control) that the timeout is instead set to a very high value of larger than 10,000 seconds:\\n\\n\\n\\nuser@host\u003e show security flow session | match timeout\\nSession ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid\\n\\nThis will lead to an accumulation of flows which can be observed by an ever-increasing value of invalidated sessions in the output of \u0027show security flow session summary\u0027:\\n\\nuser@host\u003e show security flow session summary | match invalid\\nInvalidated sessions: 216931These sessions can\u0027t be cleared manually with the \u0027clear security flow session\u0027 command, which will either lead to forwarding to stop (and the system needs to be manually recovered with a reboot) or to a flowd core and automatic reboot.\\n\\n\\nThis issue affects Junos OS on SRX Series:\\n\\n\\n  *  24.2 versions before 24.2R2-S3,\\n  *  24.4 versions before 24.4R2-S1, 24.4R2-S2,\\n  *  25.2\u00a0versions\u00a0before 25.2R1-S2, 25.2R2.\\n\\n\\n\\n\\nThis issue does not affect releases earlier than 24.2R1;\"}],\"affected\":[{\"source\":\"sirt@juniper.net\",\"affectedData\":[{\"vendor\":\"Juniper Networks\",\"product\":\"Junos OS\",\"defaultStatus\":\"unaffected\",\"platforms\":[\"SRX Series\"],\"versions\":[{\"version\":\"24.2\",\"lessThan\":\"24.2R2-S3\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"24.4\",\"lessThan\":\"24.4R2-S1\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"25.2\",\"lessThan\":\"25.2R1-S2\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"24.2R1\",\"versionType\":\"custom\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"sirt@juniper.net\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"LOW\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"YES\",\"Recovery\":\"USER\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"MODERATE\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"sirt@juniper.net\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"sirt@juniper.net\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"references\":[{\"url\":\"https://supportportal.juniper.net/JSA110090\",\"source\":\"sirt@juniper.net\"}]}}"
  }
}



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Sightings

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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.


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