CVE-2025-59958Network attack vector

Resource exhaustion and disclosure via rejected packets

Published Oct 9, 2025 · Updated Oct 9, 2025

Improper condition handling in Junos OS Evolved allows remote attackers to disrupt service and read device data through rejected packets. The PFE incorrectly forwards packets matching an output-filter reject term to the Routing Engine for further processing instead of rejecting them. The issue affects all versions before 22.4R3-EVO and 23.2 before 23.2R2-EVO only when the output filter is applied to a WAN or revenue interface.

CVSS severity6.9
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper condition handling in Junos OS Evolved allows remote attackers to disrupt service and read device data through rejected packets. The PFE incorrectly forwards packets matching an output-filter reject term to the Routing Engine for further processing instead of rejecting them. The issue affects all versions before 22.4R3-EVO and 23.2 before 23.2R2-EVO only when the output filter is applied to a WAN or revenue interface.

The record

CVE
CVE-2025-59958
Published
Oct 9, 2025
Updated
Oct 9, 2025
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-754, T1498.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <22.4R3-EVO
  2. Affected versionversion=23.2 <23.2R2-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=0 <22.4R3-EVO; version=23.2 <23.2R2-EVO

Published CVSS scores

6.9Juniper Networks, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
6.5Juniper Networks, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1498.001Direct Network Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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