Home/CVE/An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper N
CVE

CVE-2024-21586

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper N

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.

HIGH · CVSS 7.5 EPSS 0.00531
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-754Improper Check for Unusual or Exceptional Conditions
▤

Affected Products & Versions

1
juniper junosall versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · sirt@juniper.net
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Jul 2024 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://supportportal.juniper.net/JSA83195Vendor Advisory
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