CVE-2021-0253

NFX Series devices using Juniper Networks Junos OS are susceptible to a local command execution vulnerability thereby allowing an attacker to elevate their privileges via the Junos Device Management Daemon (JDMD) process. This issue affects Juniper Networks Junos OS on NFX Series 17.2 version 17.2R1 and later versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S5, 18.4R3-S5; 19.1 versions prior to 19.1R1-S3; 19.2 version 19.1R2 and later versions prior to 19.2R3; 19.3 versions prior to 19.3R3; 19.4 versions prior to 19.4R2-S2. 19.4 versions 19.4R3 and above. This issue does not affect Juniper Networks Junos OS versions prior to 17.2R1. This issue does not affect the JDMD as used by Junos Node Slicing such as External Servers use in conjunction with Junos Node Slicing and In-Chassis Junos Node Slicing on MX480, MX960, MX2008, MX2010, MX2020.

• CWE-77
• CWE-77

• https://github.com/orangecertcc/security-research/security/advisories/GHSA-vrf9-cjcp-rwcrExploit, Third Party Advisory
• https://kb.juniper.net/JSA11146Vendor Advisory
• https://github.com/orangecertcc/security-research/security/advisories/GHSA-vrf9-cjcp-rwcrExploit, Third Party Advisory
• https://kb.juniper.net/JSA11146Vendor Advisory

Published

Apr 22, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-0247A Race Condition (Concurrent Execution using Shared Resource…5.5
• CVE-2021-0248This issue is not applicable to NFX NextGen Software. On NFX…10
• CVE-2021-0249On SRX Series devices configured with UTM services a buffer …9.8
• CVE-2021-0250In segment routing traffic engineering (SRTE) environments w…7.5
• CVE-2021-0251A NULL Pointer Dereference vulnerability in the Captive Port…8.6
• CVE-2021-0252NFX Series devices using Juniper Networks Junos OS are susce…7.8
• CVE-2021-0254A buffer size validation vulnerability in the overlayd servi…9.8
• CVE-2021-0255A local privilege escalation vulnerability in ethtraceroute …7.8
• CVE-2021-0256A sensitive information disclosure vulnerability in the mosq…5.5
• CVE-2021-0257On Juniper Networks MX Series and EX9200 Series platforms wi…6.5
• CVE-2021-0258A vulnerability in the forwarding of transit TCPv6 packets r…5.9
• CVE-2021-0259Due to a vulnerability in DDoS protection in Juniper Network…7.4