Description
An Improper Handling of Length Parameter Inconsistency vulnerability in the

l2ald

daemon of Juniper Networks Junos OS and Junos OS Evolved allows an attacker who can control or impersonate a configured MC-LAG ICCP peer to disclose process heap memory or cause a denial of service via a malformed ICCP message.
Published: 2026-10-14
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

Vendor Solution

The following software releases have been updated to resolve this specific issue: Junos OS: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1, and all subsequent releases. Junos OS Evolved: 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4R2-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO, 26.2R2-EVO, 26.4R1-EVO, and all subsequent releases. Note: For Junos OS releases 23.2, 23.4, and 24.2, and Junos OS Evolved releases 23.2-EVO, 23.4-EVO, and 24.2-EVO, specific respins have been referenced. Previously published versions of these releases have been rebuilt to resolve the security vulnerabilities identified in this advisory.

Vendor Workaround

There are no known workarounds for this issue.

Tracking

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Advisories

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History

Sat, 17 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 16 Oct 2026 23:15:00 +0000

Type Values Removed Values Added
First Time appeared Juniper Networks
Juniper Networks junos Os
Juniper Networks junos Os Evolved
Vendors & Products Juniper Networks
Juniper Networks junos Os
Juniper Networks junos Os Evolved

Wed, 14 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
Description An Improper Handling of Length Parameter Inconsistency vulnerability in the l2ald daemon of Juniper Networks Junos OS and Junos OS Evolved allows an attacker who can control or impersonate a configured MC-LAG ICCP peer to disclose process heap memory or cause a denial of service via a malformed ICCP message.
Title Junos OS and Junos OS Evolved: Malformed MC-LAG ICCP message causes l2ald heap disclosure or crash
Weaknesses CWE-130
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:L'}

Subscriptions

Juniper Networks Junos Os Junos Os Evolved
cve-icon MITRE

Status: PUBLISHED

Assigner: juniper

Published:

Updated: 2026-10-16T15:31:50.485Z

Reserved: 2026-09-28T16:31:35.504Z

Link: CVE-2026-101994

cve-icon Vulnrichment

Updated: 2026-10-16T15:29:08.783Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-14T17:17:52.233

Modified: 2026-10-16T16:16:50.270

Link: CVE-2026-101994

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-16T23:00:06Z

Weaknesses
  • CWE-130

    Improper Handling of Length Parameter Inconsistency