Description
An Integer Overflow or Wraparound vulnerability in the routing daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an authenticated BGP peer to cause a denial of service via BGP route updates when extended-nexthop-tunnel is enabled.
Published: 2026-10-14
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service via routing daemon crash
Action: Immediate Patch
AI Analysis

Impact

The vulnerability is an Integer Overflow or Wraparound in the routing daemon (rpd) that allows an authenticated BGP peer to cause a denial of service through route updates when the extended-nexthop-tunnel option is enabled. An attacker can trigger a crash, resulting in loss of routing functionality and potential network outages.

Affected Systems

Juniper Networks Junos OS and Junos OS Evolved are affected. The vendors provide patched releases: for Junos OS, 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1 and all subsequent releases; for Junos OS Evolved, 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4R2-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO, 26.2R2-EVO, 26.4R1-EVO and all subsequent releases.

Risk and Exploitability

The CVSS score of 8.7 classifies this as a high severity denial-of-service flaw. EPSS score of <1% indicates a low exploitation probability, and the vulnerability has not yet been listed in the CISA KEV catalog. Exploitation requires an authenticated BGP peer to send route updates that trigger the integer overflow, implying that insiders or compromised peers can cause the crash. The impact is a crash of the routing daemon, potentially taking the device offline or impairing routing until a restart or patch is applied.

Generated by OpenCVE AI on October 15, 2026 at 17:23 UTC.

Remediation

Vendor Solution

The following software releases have been updated to resolve this specific issue: Junos OS: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1, and all subsequent releases. Junos OS Evolved: 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4R2-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO, 26.2R2-EVO, 26.4R1-EVO, and all subsequent releases. Note: For Junos OS releases 23.2, 23.4, and 24.2, and Junos OS Evolved releases 23.2-EVO, 23.4-EVO, and 24.2-EVO, specific respins have been referenced. Previously published versions of these releases have been rebuilt to resolve the security vulnerabilities identified in this advisory.

Vendor Workaround

There are no known workarounds for this issue.

OpenCVE Recommended Actions

  • Apply the latest Junos OS or Junos OS Evolved release that includes the fix, as listed by Juniper.
  • Restrict BGP peering to authenticated, trusted neighbors and disable any untrusted peer updates that may trigger the overflow.
  • Continuously monitor the routing daemon logs for segmentation faults or repeated crashes, and verify all BGP peers are properly authenticated to prevent malicious updates.
  • No workaround is available; patching is mandatory.

Generated by OpenCVE AI on October 15, 2026 at 17:23 UTC.

Tracking

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Advisories

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History

Sat, 17 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
First Time appeared Juniper Networks
Juniper Networks junos Os
Juniper Networks junos Os Evolved
Vendors & Products Juniper Networks
Juniper Networks junos Os
Juniper Networks junos Os Evolved

Fri, 16 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 14 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
Description An Integer Overflow or Wraparound vulnerability in the routing daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an authenticated BGP peer to cause a denial of service via BGP route updates when extended-nexthop-tunnel is enabled.
Title Junos OS and Junos OS Evolved: An attacker causes a routing daemon crash when BGP extended-nexthop-tunnel is used
Weaknesses CWE-190
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/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'}

Subscriptions

Juniper Networks Junos Os Junos Os Evolved
cve-icon MITRE

Status: PUBLISHED

Assigner: juniper

Published:

Updated: 2026-10-16T16:42:13.376Z

Reserved: 2026-09-28T17:33:49.410Z

Link: CVE-2026-102024

cve-icon Vulnrichment

Updated: 2026-10-16T16:42:09.271Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-14T17:17:55.463

Modified: 2026-10-16T17:17:07.387

Link: CVE-2026-102024

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-17T00:00:07Z

Weaknesses
  • CWE-190

    Integer Overflow or Wraparound