CVE-2026-102034: CWE-617 Reachable Assertion in Juniper Networks Junos OS
Description
A Reachable Assertion vulnerability in the l2ald daemon of Juniper Networks Junos OS and Junos OS Evolved allows an attacker with access to a configured ICCP peer to cause a denial of service via a malformed MC-LAG message.
CVSS v3.1
Score 6.5medium
Affected software
Juniper Networks
Junos OS
Juniper Networks
Junos OS Evolved
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-102034) involves a reachable assertion failure in the l2ald daemon component of Juniper Networks Junos OS and Junos OS Evolved. An attacker who has access to a configured ICCP peer can exploit this by sending a malformed MC-LAG message, triggering an assertion that leads to a denial of service condition. The vulnerability is tracked under CWE-617 (Reachable Assertion). The CVSS v3.1 base score is 6.5, reflecting a medium severity with attack vector as adjacent network, low attack complexity, no privileges required, no user interaction, and impact limited to availability.
Potential Impact
Successful exploitation causes denial of service by crashing or disrupting the l2ald daemon, impacting availability of affected Junos OS devices. There is no impact on confidentiality or integrity. The attacker must have access to a configured ICCP peer, limiting the attack surface to trusted network segments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restricting access to ICCP peers and monitoring for malformed MC-LAG messages may reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-09-28T17:33:49.411Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfb6672cdf04f6569794bf
Added to database: 10/14/2026, 17:05:43 UTC
Last enriched: 10/14/2026, 18:35:22 UTC
Last updated: 10/14/2026, 20:49:11 UTC
Views: 2
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