CVE-2026-102083 Juniper Networks CVE debrief

Who should care

SRX Series administrators and security teams with WebFiltering enabled should assess exposure and prioritize remediation based on deployment context and risk tolerance. They should review and apply Juniper Networks' recommended patches, verify WebFiltering configurations, and monitor HTTP traffic loads to prevent sustained high loads.

Why it matters

CVE-2026-102083 is a medium-severity vulnerability in Juniper Networks Junos OS on SRX Series devices with WebFiltering enabled. When the WebFiltering cloud server is unreachable, sustained HTTP traffic load can cause a Denial-of-Service (DoS). SRX Series administrators and security teams should assess exposure and prioritize remediation based on deployment context and risk tolerance.

• Potential Denial-of-Service (DoS) due to sustained HTTP traffic load.
• Complete service outage until the system recovers.
• Need for verification of affected versions and WebFiltering configurations.
• Potential for increased risk if WebFiltering cloud server is unreachable.

Technical summary

An Improper Resource Locking vulnerability in Juniper Networks Junos OS on SRX Series devices allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS) when UTM WebFiltering is configured and the WebFiltering cloud server is unreachable. Sustained HTTP traffic load may cause the UTM subsystem to crash and restart, leading to a complete service outage. This issue applies to both NextGeneration WebFiltering (NGWF) and Enhanced WebFiltering (EWF). Affected versions include 23.2 versions from 23.2R2 before 23.2R2-S7.7, 23.4 versions from 23.4R2 before 23.4R2-S8.13, 24.2 versions before 24.2R2-S5.5, 24.4 versions before 24.4R2-S4, 25.2 versions before 25.2R2-S1, and 25.4 versions before 25

Defensive priority

Medium-priority assessment and remediation recommended for affected SRX Series deployments with WebFiltering enabled.

Recommended defensive actions

• Review and apply Juniper Networks' recommended patches for affected Junos OS versions on SRX Series devices.
• Verify WebFiltering configurations and consider temporarily disabling WebFiltering if the cloud server is unreachable.
• Monitor HTTP traffic loads and adjust configurations to prevent sustained high loads.
• Assess exposure and prioritize remediation based on deployment context and risk tolerance.
• Perform vulnerability assessment and penetration testing to identify potential attack vectors.
• Implement compensating controls, such as rate limiting or IP blocking, to mitigate potential attacks.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information on the vulnerability. The Juniper Networks support portal offers additional guidance. Evidence limits are based on available information from these sources. Affected scope and severity are confirmed through CVE Program and NVD details. Defenders should verify affected versions, WebFiltering configurations, and HTTP traffic loads.

Sources and 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.