CVE-2024-21586

highpriority · track · 0EPSS 0.005 · 43 %ileDEEUNLRUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.50% (43rd) EPSS

CVSS 7.5 · high

Is it mine?

23 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · ncsc_nl

EPSS · scored 2026-10-27

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series and NFX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). If an affected device receives specific valid traffic destined to the device, it will cause the PFE to crash and restart. Continued receipt and processing of this traffic will create a sustained DoS condition. This issue affects Junos OS on SRX Series: * 21.4 versions before 21.4R3-S7.9, * 22.1 versions before 22.1R3-S5.3, * 22.2 versions before 22.2R3-S4.11, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R3. This issue affects Junos OS on NFX Series: * 21.4 versions before 21.4R3-S8, * 22.1 versions after 22.1R1, * 22.2 versions before 22.2R3-S5, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R3. Junos OS versions prior to 21.4R1 are not affected by this issue.

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · sirt@juniper.net USexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · NCSC-NL NL

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-754USCWE-754USCWE-754US

affected products (23)

Products and version ranges known to be affected.

Juniper Networks Junos OS≤ 22.1enisa_euvdEU
Juniper Networks Junos OS21.4 → 21.4R3-S7.9enisa_euvdEU
Juniper Networks Junos OS21.4 → 21.4R3-S8enisa_euvdEU
Juniper Networks Junos OS22.1 → 22.1R3-S5.3enisa_euvdEU
Juniper Networks Junos OS22.2 → 22.2R3-S4.11enisa_euvdEU
Juniper Networks Junos OS22.2 → 22.2R3-S5enisa_euvdEU
Juniper Networks Junos OS22.3 → 22.3R3enisa_euvdEU
Juniper Networks Junos OS22.4 → 22.4R3enisa_euvdEU
Juniper Networks Inc. JunOS21.4 → 21.4R3-S7.9fstec_bduRU
Juniper Networks Inc. JunOS22.1 → 22.1R3-S5.3fstec_bduRU
Juniper Networks Inc. JunOS22.2 → 22.2R3-S4.11fstec_bduRU
Juniper Networks Inc. JunOS22.3 → 22.3R3fstec_bduRU
Juniper Networks Inc. JunOS22.4 → 22.4R3fstec_bduRU
junos_osall versionsncsc_nlNLcpe:2.3:a:juniper_networks:junos_os:21.4:*:*:*:*:*:*:*
junos_osall versionsncsc_nlNLcpe:2.3:a:juniper_networks:junos_os:22.1:*:*:*:*:*:*:*
junos_osall versionsncsc_nlNLcpe:2.3:a:juniper_networks:junos_os:22.2:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
juniper junos= 21.4nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
juniper junos= 22.1nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*

showing 20 of 23

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2024-0277Kwetsbaarheid verholpen in Juniper JunOSNL2024-07-03csaf · ncsc_nlNL
Juniper heeft een kwetsbaarheid verholpen in JunOS (Specifiek voor SRX series systemen)
WID-SEC-W-2024-1500Juniper JUNOS: Schwachstelle ermöglicht Denial of ServiceDeutsch2024-07-01csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Juniper JUNOS ausnutzen, um einen Denial of Service Angriff durchzuführen.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu ncsc_nl nvd cert_bund NVD CVE.org MITRE

published 2024-07-01modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

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