PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-102043 Juniper Networks CVE debrief

CVE-2026-102043 debrief based on the supplied source corpus. The CVE record was published on 2026-10-14T16:52:11.938Z and has not been modified since then. This medium-severity vulnerability in Junos OS and Junos OS Evolved can cause a routing-process crash when MPLS-TE fast reroute is enabled. Network administrators and security teams should assess their exposure and prioritize patching. The vulnerability is caused by a Numeric Truncation Error in the rpd process, allowing an adjacent attacker to crash the routing process via MPLS-TE fast-reroute signaling.

Vendor
Juniper Networks
Product
Junos OS
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Network administrators and security teams responsible for managing Juniper Networks Junos OS and Junos OS Evolved systems should assess their exposure and prioritize patching.

Why it matters

CVE-2026-102043 is a medium-severity vulnerability in Junos OS and Junos OS Evolved that can cause a routing-process crash when MPLS-TE fast reroute is enabled. Network administrators and security teams should prioritize verifying and applying patches, reviewing network configurations, and monitoring system logs.

  • Verify and apply patches to prevent routing process crashes
  • Monitor system logs for signs of exploitation attempts
  • Review and update network configurations to prevent potential attacks

Technical summary

A Numeric Truncation Error vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker to crash the routing process via MPLS-TE fast-reroute signaling. The vulnerability affects various versions of Junos OS and Junos OS Evolved, including those prior to 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, and 26.2R1-S2. Network administrators and security teams should prioritize verifying and applying patches.

Defensive priority

Network administrators and security teams should prioritize verifying and applying patches for Juniper Networks Junos OS and Junos OS Evolved, especially for versions prior to 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, and 26.2R1-S2.

Recommended defensive actions

  • Verify and apply patches for affected Junos OS and Junos OS Evolved versions
  • Review and update network configurations to prevent potential attacks
  • Monitor system logs for signs of exploitation attempts

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, CVSS score, and affected versions of Junos OS and Junos OS Evolved. However, there is limited information on potential exploits or attacks.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-102043 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-102043

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-102043 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-102043

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.