CVE-2026-101979: CWE-121 Stack-based Buffer Overflow in Juniper Networks Junos OS
Description
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.
CVSS v3.1
Score 8.8high
Affected software
Juniper Networks
Junos OS
Juniper Networks
Junos OS Evolved
pkg:rpm/juniper/junos-ospkg:rpm/juniper/junos-os-evolvedRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-101979) is a stack-based buffer overflow in the authd process of Juniper Networks Junos OS and Junos OS Evolved. An attacker with SNMP read access can exploit this flaw by sending a specially crafted SNMP packet when SNMP and AAA are enabled, potentially leading to arbitrary code execution with root privileges or denial of service. The vulnerability affects a broad range of Junos OS versions and their Evolved variants prior to the fixed releases indicated by the version ranges. The CVSS 3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows a network attacker with SNMP read access to execute arbitrary code with root privileges or cause a denial of service condition on affected Junos OS devices. This can lead to full system compromise or service disruption.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official patch links were provided in the input data. Until a patch is available, consider disabling SNMP or AAA if feasible, or restricting SNMP read access to trusted sources only to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-09-28T16:31:35.503Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfbd882cdf04f6569a6b77
Added to database: 10/14/2026, 17:36:08 UTC
Last enriched: 10/14/2026, 17:49:06 UTC
Last updated: 10/14/2026, 19:34:08 UTC
Views: 10
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