CVE-2025-52951Network attack vector

Control-plane firewall bypass via ignored payload-protocol match

Published Jul 11, 2025 · Updated Jul 15, 2025

Protection mechanism failure in Juniper Networks Junos OS allows remote attackers to bypass control-plane IPv6 firewall filters. Kernel filter processing treats any control-plane IPv6 firewall term containing payload-protocol as an unconditional accept and skips its other match criteria. The bypass requires that match in a filter protecting traffic destined to the device; transit filtering is unaffected.

CVSS severity5.8
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Protection mechanism failure in Juniper Networks Junos OS allows remote attackers to bypass control-plane IPv6 firewall filters. Kernel filter processing treats any control-plane IPv6 firewall term containing payload-protocol as an unconditional accept and skips its other match criteria. The bypass requires that match in a filter protecting traffic destined to the device; transit filtering is unaffected.

The record

CVE
CVE-2025-52951
Published
Jul 11, 2025
Updated
Jul 15, 2025
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-693, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 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=0 <21.2R3-S9
  2. Affected versionversion=21.4 <21.4R3-S11
  3. Affected versionversion=22.2 <22.2R3-S7
  4. Affected versionversion=22.4 <22.4R3-S7
  5. Affected versionversion=23.2 <23.2R2-S4
  6. Affected versionversion=23.4 <23.4R2-S5
  7. Affected versionversion=24.2 <24.2R2-S1
  8. Affected versionversion=24.4 <24.4R1-S2, 24.4R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <21.2R3-S9; version=21.4 <21.4R3-S11; version=22.2 <22.2R3-S7; version=22.4 <22.4R3-S7; version=23.2 <23.2R2-S4; version=23.4 <23.4R2-S5; version=24.2 <24.2R2-S1; version=24.4 <24.4R1-S2, 24.4R2

Published CVSS scores

5.8Juniper Networks, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
6.9Juniper Networks, Inc.CVSS: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:Y/R:U/V:X/RE:M/U:X

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-693Protection Mechanism Failure
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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