CVE-2025-52953

BGP service interruption via valid UPDATE packet

Published Jul 11, 2025 · Updated Jul 11, 2025

Expected behavior violation in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers with BGP adjacency to reset sessions. The routing protocol daemon processes a valid BGP UPDATE for an enabled inet6-vpn unicast family and resets the associated session instead of preserving it. An unauthenticated iBGP or eBGP peer can repeat the packet over IPv4 or IPv6 to sustain loss of BGP service; no data disclosure or modification is reported.

CVSS severity7.1
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Expected behavior violation in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers with BGP adjacency to reset sessions. The routing protocol daemon processes a valid BGP UPDATE for an enabled inet6-vpn unicast family and resets the associated session instead of preserving it. An unauthenticated iBGP or eBGP peer can repeat the packet over IPv4 or IPv6 to sustain loss of BGP service; no data disclosure or modification is reported.

The record

CVE
CVE-2025-52953
Published
Jul 11, 2025
Updated
Jul 11, 2025
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-440, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 11, 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 <22.2R3-S7-EVO
  2. Affected versionversion=22.4-EVO <22.4R3-S7-EVO
  3. Affected versionversion=23.2-EVO <23.2R2-S4-EVO
  4. Affected versionversion=23.4-EVO <23.4R2-S4-EVO
  5. Affected versionversion=24.2-EVO <24.2R2-EVO
  6. Affected versionversion=24.4-EVO <24.4R1-S3-EVO, 24.4R2-EVO

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=0 <22.2R3-S7-EVO; version=22.4-EVO <22.4R3-S7-EVO; version=23.2-EVO <23.2R2-S4-EVO; version=23.4-EVO <23.4R2-S4-EVO; version=24.2-EVO <24.2R2-EVO; version=24.4-EVO <24.4R1-S3-EVO, 24.4R2-EVO
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-S4; version=24.2 <24.2R2; version=24.4 <24.4R1-S3, 24.4R2

Published CVSS scores

7.1Juniper NetworksCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber
6.5Juniper NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

Weakness, pattern, technique

CWE-440Expected Behavior Violation
T1499.004Application or System Exploitation

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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