CVE-2024-39561 (GCVE-0-2024-39561)
Vulnerability from cvelistv5 – Published: 2024-07-10 22:46 – Updated: 2024-08-02 04:26
VLAI
EPSS
VEX
Title
Junos OS: SRX4600, SRX5000 Series: TCP packets with SYN/FIN or SYN/RST are transferred after enabling no-syn-check with Express Path
Summary
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on
SRX4600 and SRX5000 Series
allows an attacker to send TCP packets with
SYN/FIN or SYN/RST
flags, bypassing the expected blocking of these packets.
A TCP packet with SYN/FIN or SYN/RST should be dropped in flowd. However, when no-syn-check and Express Path are enabled, these TCP packets are unexpectedly transferred to the downstream network.
This issue affects Junos OS on SRX4600 and SRX5000 Series:
* All versions before 21.2R3-S8,
* from 21.4 before 21.4R3-S7,
* from 22.1 before 22.1R3-S6,
* from 22.2 before 22.2R3-S4,
* from 22.3 before 22.3R3-S3,
* from 22.4 before 22.4R3-S2,
* from 23.2 before 23.2R2,
* from 23.4 before 23.4R1-S1, 23.4R2.
Severity
5.8 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-11 13:23 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://supportportal.juniper.net/JSA83021 | vendor-advisory |
Impacted products
7 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
0 , < 21.2R3-S8
(semver)
Affected: 21.4 , < 21.4R3-S7 (semver) Affected: 22.1 , < 22.1R3-S6 (semver) Affected: 22.2 , < 22.2R3-S4 (semver) Affected: 22.3 , < 22.3R3-S3 (semver) Affected: 22.4 , < 22.4R3-S2 (semver) Affected: 23.2 , < 23.2R2 (semver) Affected: 23.4 , < 23.4R1-S1, 23.4R2 (semver) |
guessed | |
| juniper | junos |
Affected:
0 , < 21.2r3-s8
(custom)
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* |
||
| juniper | junos |
Affected:
21.4 , < 21.4r3-s7
(custom)
cpe:2.3:o:juniper:junos:21.4:*:*:*:*:*:*:* |
||
| juniper | junos |
Affected:
22.2 , < 22.2r3-s4
(custom)
cpe:2.3:o:juniper:junos:22.2:*:*:*:*:*:*:* |
||
| juniper | junos |
Affected:
22.3 , < 22.3r3-s3
(custom)
cpe:2.3:o:juniper:junos:22.3:*:*:*:*:*:*:* |
||
| juniper | junos |
Affected:
22.4 , < 22.4r3-s2
(custom)
cpe:2.3:o:juniper:junos:22.4:*:*:*:*:*:*:* |
||
| juniper | junos |
Affected:
23.2 , < 23.2r2
(custom)
cpe:2.3:o:juniper:junos:23.2:*:*:*:*:*:*:* |
Date Public
2024-07-10 16:00
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"lang": "en",
"value": "An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on \n\nSRX4600 and SRX5000 Series\n\n allows an attacker to send TCP packets with \n\nSYN/FIN or SYN/RST\n\n flags, bypassing the expected blocking of these packets.\n\nA TCP packet with SYN/FIN or SYN/RST should be dropped in flowd. However, when no-syn-check and Express Path\u00a0are enabled, these TCP packets are unexpectedly transferred to the downstream network.\n\nThis issue affects Junos OS on SRX4600 and SRX5000 Series: \n\n\n * All versions before 21.2R3-S8, \n * from 21.4 before 21.4R3-S7, \n * from 22.1 before 22.1R3-S6, \n * from 22.2 before 22.2R3-S4, \n * from 22.3 before 22.3R3-S3, \n * from 22.4 before 22.4R3-S2, \n * from 23.2 before 23.2R2, \n * from 23.4 before 23.4R1-S1, 23.4R2."
},
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"lang": "es",
"value": "Una vulnerabilidad de verificaci\u00f3n inadecuada de condiciones inusuales o excepcionales en el demonio de flujo (flowd) de Juniper Networks Junos OS en las series SRX4600 y SRX5000 permite a un atacante enviar paquetes TCP con indicadores SYN/FIN o SYN/RST, evitando el bloqueo esperado de estos paquetes. . Un paquete TCP con SYN/FIN o SYN/RST debe descartarse en flowd. Sin embargo, cuando no-syn-check y Express Path est\u00e1n habilitados, estos paquetes TCP se transfieren inesperadamente a la red descendente. Este problema afecta a Junos OS en las series SRX4600 y SRX5000: * Todas las versiones anteriores a 21.2R3-S8, * desde 21.4 antes de 21.4R3-S7, * desde 22.1 antes de 22.1R3-S6, * desde 22.2 antes de 22.2R3-S4, * desde 22.3 antes de 22.3R3-S3, * desde 22.4 antes de 22.4R3-S2, * desde 23.2 antes de 23.2R2, * desde 23.4 antes de 23.4R1-S1, 23.4R2."
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"id": "CVE-2024-39561",
"lastModified": "2026-06-17T07:42:14.080",
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"title": "Junos OS: SRX4600, SRX5000 Series: TCP packets with SYN/FIN or SYN/RST are transferred after enabling no-syn-check with Express Path",
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.