Vulnerability-Lookup

FKIE_CVE-2026-57030

Vulnerability from fkie_nvd - Published: 2026-07-09 22:17 - Updated: 2026-07-13 20:16

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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;

References

	URL	Tags
	sirt@juniper.net	https://supportportal.juniper.net/JSA110090	Vendor Advisory

Impacted products

Vendor	Product	Version
juniper	junos	24.2
juniper	junos	24.2
juniper	junos	24.2
juniper	junos	24.2
juniper	junos	24.2
juniper	junos	24.2
juniper	junos	24.2
juniper	junos	24.4
juniper	junos	24.4
juniper	junos	24.4
juniper	junos	24.4
juniper	junos	24.4
juniper	junos	25.2
juniper	junos	25.2
juniper	junos	25.2
juniper	srx1500	-
juniper	srx1600	-
juniper	srx2300	-
juniper	srx300	-
juniper	srx320	-
juniper	srx340	-
juniper	srx345	-
juniper	srx380	-
juniper	srx400	-
juniper	srx4100	-
juniper	srx4120	-
juniper	srx4200	-
juniper	srx4300	-
juniper	srx440	-
juniper	srx4600	-
juniper	srx4700	-
juniper	srx5400	-
juniper	srx5600	-
juniper	srx5800	-

JSON

To clipboard

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  "descriptions": [
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      "lang": "en",
      "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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  "id": "CVE-2026-57030",
  "lastModified": "2026-07-13T20:16:07.750",
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}

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

Vulnerability from cvelistv5 – Published: 2026-07-09 21:13 – Updated: 2026-07-10 14:43

Title

Junos OS: SRX Series: Flow sessions are not getting cleared leading to a DoS

Summary

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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

juniper

References

1 reference

URL	Tags
https://supportportal.juniper.net/JSA110090	vendor-advisory

Impacted products

1 product

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)

Date Public

2026-07-08 16:00

Show details on NVD website

JSON

To clipboard

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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"
            }
          ],
          "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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              "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
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            "baseScore": 5.9,
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
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            "baseScore": 8.2,
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            "valueDensity": "NOT_DEFINED",
            "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/AU:Y/R:U/RE:M",
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              "cweId": "CWE-362",
              "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-07-09T21:13:12.671Z",
        "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
        "shortName": "juniper"
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      "references": [
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          "tags": [
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          "url": "https://supportportal.juniper.net/JSA110090"
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            }
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          "value": "The following software releases have been updated to resolve this specific issue:\n\nJunos OS: 24.2R2-S3, 24.4R2-S1, 25.2R1-S2, 25.2R2, 25.4R1, and all subsequent releases."
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      "source": {
        "advisory": "JSA110090",
        "defect": [
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        "discovery": "USER"
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      "title": "Junos OS: SRX Series: Flow sessions are not getting cleared leading to a DoS",
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    "assignerShortName": "juniper",
    "cveId": "CVE-2026-57030",
    "datePublished": "2026-07-09T21:13:12.671Z",
    "dateReserved": "2026-06-23T16:27:00.249Z",
    "dateUpdated": "2026-07-10T14:43:39.183Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

FKIE_CVE-2026-57030

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

Tags

Sightings

Nomenclature