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PatchSiren cyber security CVE debrief

CVE-2026-101983 Juniper Networks CVE debrief

A Stack-based Buffer Overflow vulnerability in the httpd process of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network attacker to cause remote code execution and denial of service via a J-Web virtual-domain configured. The vulnerability affects multiple versions of Junos OS and Junos OS Evolved. Network administrators and security teams should assess exposure, apply security patches, and restrict access to J-Web virtual-domain configurations. This vulnerability has a high defensive priority, indicating a need for immediate attention and remediation. The CVE record and source item provide details on the vulnerability, but limited information is ...

Vendor
Juniper Networks
Product
Junos OS
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-15
Advisory published
2026-10-14
Advisory updated
2026-10-15

Who should care

Network administrators and security teams responsible for Junos OS and Junos OS Evolved deployments should assess exposure and apply security patches.

Why it matters

CVE-2026-101983 is a critical vulnerability in Junos OS and Junos OS Evolved that allows remote code execution and denial of service. Network administrators and security teams should assess exposure, apply security patches, and restrict access to J-Web virtual-domain configurations.

  • Remote code execution and denial of service via J-Web virtual-domain configurations
  • Potential disruption of network operations
  • Need for verification of affected versions and inventory checks
  • Priority for applying security patches and restricting access to J-Web virtual-domain configurations

Technical summary

A Stack-based Buffer Overflow vulnerability in the httpd process of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network attacker to cause remote code execution and denial of service via a J-Web virtual-domain configured. The vulnerability affects multiple versions of Junos OS and Junos OS Evolved.

Defensive priority

High

Recommended defensive actions

  • Review and apply Juniper Networks' security patches for affected Junos OS and Junos OS Evolved versions
  • Restrict access to J-Web virtual-domain configurations
  • Monitor network traffic for suspicious activity
  • Verify inventory of Junos OS and Junos OS Evolved deployments

Evidence notes

The CVE record and source item provide details on the vulnerability, but limited information is available on exploitation or affected versions. The official CVE Program record and NIST NVD detail page offer source-provided CVE metadata and vulnerability assessments. A vendor advisory with security patch information is also available. Defenders should verify affected versions, review inventory, and apply security patches. They should also restrict access to J-Web virtual-domain ...

Sources and references

Verified primary and authoritative sources

  • CVE-2026-101983 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-101983

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

  • CVE-2026-101983 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-101983

    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.