CVE-2025-52985Network attack vector

Firewall bypass via oversized prefix-list mismatch

Published Jul 11, 2025 · Updated Jul 18, 2025

Incorrect filtering in Juniper Networks Junos OS Evolved allows remote attackers to bypass Routing Engine firewall restrictions. A firewall filter on lo0 output or re:mgmt input or output fails to match from prefix-list when the referenced IPv4 or IPv6 prefix list has more than 10 entries. The affected nondefault filter configuration leaves packets to or from the local device unfiltered, permitting traffic that the policy was intended to block.

CVSS severity6.9
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect filtering in Juniper Networks Junos OS Evolved allows remote attackers to bypass Routing Engine firewall restrictions. A firewall filter on lo0 output or re:mgmt input or output fails to match from prefix-list when the referenced IPv4 or IPv6 prefix list has more than 10 entries. The affected nondefault filter configuration leaves packets to or from the local device unfiltered, permitting traffic that the policy was intended to block.

The record

CVE
CVE-2025-52985
Published
Jul 11, 2025
Updated
Jul 18, 2025
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-480, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=23.2R2-S3-EVO <23.2R2-S4-EVO
  2. Affected versionversion=23.4R2-S3-EVO <23.4R2-S5-EVO
  3. Affected versionversion=24.2R2-EVO <24.2R2-S1-EVO
  4. Affected versionversion=24.4-EVO <24.4R1-S3-EVO, 24.4R2-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=23.2R2-S3-EVO <23.2R2-S4-EVO; version=23.4R2-S3-EVO <23.4R2-S5-EVO; version=24.2R2-EVO <24.2R2-S1-EVO; version=24.4-EVO <24.4R1-S3-EVO, 24.4R2-EVO

Published CVSS scores

6.9Juniper NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
5.3Juniper NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-480Use of Incorrect Operator
T1190Exploit Public-Facing Application

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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