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CVE-2026-101937 Juniper Networks CVE debrief

A Signed to Unsigned Conversion Error vulnerability in the srxpfe of Juniper Networks Junos OS on the SRX Series allows an adjacent attacker to cause a denial of service of the data plane via chassis-cluster fabric traffic. This medium-severity vulnerability affects Junos OS SRX Series deployments using chassis-cluster high availability. Defenders responsible for these deployments should assess exposure, prioritize patching, and consider compensating controls to mitigate potential data-plane denial of service and disruption to high-availability configurations.

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

Defenders responsible for Junos OS SRX Series deployments using chassis-cluster high availability should assess exposure and prioritize patching

Why it matters

CVE-2026-101937 is a medium-severity vulnerability in Junos OS on SRX Series devices that can cause data-plane denial of service when chassis-cluster high availability is used. Defenders responsible for these deployments should assess exposure, prioritize patching, and consider compensating controls. The vulnerability's impact on network availability and reliability requires verification of affected versions and configurations.

  • Denial of service to data-plane traffic
  • Potential disruption to high-availability configurations
  • Need for verification of affected versions and configurations
  • Potential impact on network availability and reliability

Technical summary

A Signed to Unsigned Conversion Error vulnerability in the srxpfe of Juniper Networks Junos OS on the SRX Series allows an adjacent attacker to cause a denial of service of the data plane via chassis-cluster fabric traffic. The vulnerability is caused by improper conversion of signed values to unsigned values, which can lead to a denial of service condition. Affected Junos OS versions on SRX Series devices require patching to prevent potential data-plane denial of service and disruption to high-availability configurations.

Defensive priority

Medium priority for Junos OS SRX Series deployments using chassis-cluster high availability

Recommended defensive actions

  • Review and apply Juniper Networks' patch for affected Junos OS versions on SRX Series devices
  • Verify chassis-cluster high availability configurations and consider compensating controls
  • Monitor data-plane traffic for potential denial-of-service attempts

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information about the vulnerability. The Juniper Networks support portal provides additional vendor-specific information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-101937 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-101937

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

  • CVE-2026-101937 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-101937

    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.