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8.7

Junos OS enables attacker to gain root or crash system

CVE-2026-101979 · published 21 days ago
Summary

If SNMP monitoring and AAA authentication are turned on, a specially crafted SNMP request can overflow a buffer in the authentication service of Junos OS and Junos OS Evolved. This lets a remote attacker run code with full system privileges or shut down the device. Disable SNMP or apply the vendor’s security update to stop the risk.

What to do
  • Update juniper networks junos os to version 23.2R2-S7.7 or later.
  • Update juniper networks junos os evolved to version 23.2R2-S7.7-EVO or later.
Affected software
VendorProductAffected versions
juniper networks junos os < 23.2R2-S7.7
juniper networks junos os evolved < 23.2R2-S7.7-EVO
Original advisory text
Junos OS and Junos OS Evolved: A network attacker causes root-level code execution or denial of service when SNMP and AAA are enabled
A Stack-based Buffer Overflow vulnerability in the authd Juniper Networks Junos OS and Junos OS Evolved allows a network attacker with SNMP read access to execute code with root privileges or cause a denial of service via a specific SNMP packet, when SNMP and AAA are enabled.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.7 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-121Stack-based Buffer Overflow
Timeline
Published14 Oct 2026
Updated4 Nov 2026
First seen14 Oct 2026
Sources
CVE-2026-101979 · NVD
CVE-2026-101979 · MITRE
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