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CVE-2026-102033 Juniper Networks CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-10-14T16:50:18.448Z and has not been modified since then. This vulnerability affects Juniper Networks Junos OS and Junos OS Evolved, specifically an Improper Validation of Specified Quantity in Input vulnerability in l2ald that allows an adjacent attacker to cause a denial of service via an ICCP MC-LAG message. Network administrators and security teams should assess exposure and prioritize patching, 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.

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 Juniper Networks Junos OS and Junos OS Evolved devices should assess exposure and prioritize patching.

Why it matters

CVE-2026-102033 is a denial of service vulnerability in Juniper Networks Junos OS and Junos OS Evolved that requires verification and patching to prevent exploitation.

  • Denial of service via ICCP MC-LAG message
  • Potential network downtime and disruption
  • Need for patch verification and application
  • Possible impact on network availability

Technical summary

An Improper Validation of Specified Quantity in Input vulnerability in l2ald of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker to cause a denial of service via an ICCP MC-LAG message. The vulnerability is caused by improper validation of specified quantity in input, which can lead to a denial of service. Affected product deployments should be reviewed, and patches should be applied to prevent exploitation. The vulnerability has a CVSS score of 6.5 and a severity of MEDIUM.

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 Juniper Networks Junos OS and Junos OS Evolved
  • Review and update network configurations to prevent exploitation
  • Monitor network devices for suspicious activity
  • Implement compensating controls to mitigate potential impact

Evidence notes

The CVE record and source item provide details on the vulnerability in Juniper Networks Junos OS and Junos OS Evolved, specifically an Improper Validation of Specified Quantity in Input vulnerability in l2ald that allows an adjacent attacker to cause a denial of service via an ICCP MC-LAG message.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-102033 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-102033

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

  • CVE-2026-102033 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-102033

    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.