CVE-2024-39561

mediumpriority · track · 0EPSS 0.003 · 24 %ileDEEUNLRUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.31% (24th) EPSS

CVSS 5.8 · medium

Is it mine?

35 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.9

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.7–6.9

v3.15.8mediumAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · sirt@juniper.net USexploitability 3.9 · impact 1.4

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · NCSC-NL NL

v4.06.9mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:Nsecondary · ENISA EU

v4.06.9mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/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:X/R:X/V:X/RE:X/U:Xsecondary · sirt@juniper.net US

v4.02.7lowCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:U/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:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-754USprimaryCWE-754USCWE-754US

affected products (35)

Products and version ranges known to be affected.

Juniper JUNOSall versionscert_bundDEcpe:/o:juniper:junos:-
Juniper Networks Junos OS0 → 21.2R3-S8enisa_euvdEU
Juniper Networks Junos OS21.4 → 21.4R3-S7enisa_euvdEU
Juniper Networks Junos OS22.1 → 22.1R3-S6enisa_euvdEU
Juniper Networks Junos OS22.2 → 22.2R3-S4enisa_euvdEU
Juniper Networks Junos OS22.3 → 22.3R3-S3enisa_euvdEU
Juniper Networks Junos OS22.4 → 22.4R3-S2enisa_euvdEU
Juniper Networks Junos OS23.2 → 23.2R2enisa_euvdEU
Juniper Networks Junos OS23.4 → 23.4R1-S1, 23.4R2enisa_euvdEU
Juniper Networks Inc. JunOS≤ 21.2R3-S8fstec_bduRU
Juniper Networks Inc. JunOS21.4 → 21.4R3-S7fstec_bduRU
Juniper Networks Inc. JunOS22.1 → 22.1R3-S6fstec_bduRU
Juniper Networks Inc. JunOS22.2 → 22.2R3-S4fstec_bduRU
Juniper Networks Inc. JunOS22.3 → 22.3R3-S3fstec_bduRU
Juniper Networks Inc. JunOS22.4 → 22.4R3-S2fstec_bduRU
Juniper Networks Inc. JunOS23.2 → 23.2R2fstec_bduRU
Juniper Networks Inc. JunOS23.4 → 23.4R1-S1fstec_bduRU
Juniper Networks Inc. JunOS23.4 → 23.4R2fstec_bduRU
junos_osall versionsncsc_nlNLcpe:2.3:a:juniper_networks:junos_os:22.3:*:*:*:*:*:*:*
junos_osall versionsncsc_nlNLcpe:2.3:a:juniper_networks:junos_os:22.4:*:*:*:*:*:*:*

showing 20 of 35

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2024-0290Kwetsbaarheden verholpen in Juniper Junos OS en Junos OS EvolvedNL2024-07-12csaf · ncsc_nlNL
Er zijn kwetsbaarheden gevonden en verholpen in Juniper Junos OS en Junos OS Evolved.
WID-SEC-W-2024-1591Juniper JUNOS: Mehrere SchwachstellenDeutsch2024-07-10csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Juniper JUNOS ausnutzen, um einen Denial of Service zu verursachen, Informationen offenzulegen, Privilegien zu erweitern und Sicherheitsmechanismen inklusive zu umgehen.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund ncsc_nl NVD CVE.org MITRE

published 2024-07-10modified 2026-06-17

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references (4)

External citations — patches, advisories, analysis.

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