Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2023-22406 — juniper / junos

Missing Release of Memory after Effective Lifetime

A Missing Release of Memory after Effective Lifetime vulnerability in the kernel of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS). In a segment-routing scenario with OSPF as IGP, when a peer interface continuously flaps, next-hop churn will happen and a continuous increase in Routing Protocol Daemon (rpd) memory consumption will be observed. This will eventually lead to an rpd crash and restart when the memory is full. The memory consumption can be monitored using the CLI command "show task memory detail" as shown in the following example: user@host> show task memory detail | match "RT_NEXTHOPS_TEMPLATE|RT_TEMPLATE_BOOK_KEE" RT_NEXTHOPS_TEMPLATE 1008 1024 T 50 51200 50 51200 RT_NEXTHOPS_TEMPLATE 688 768 T 50 38400 50 38400 RT_NEXTHOPS_TEMPLATE 368 384 T 412330 158334720 412330 158334720 RT_TEMPLATE_BOOK_KEE 2064 2560 T 33315 85286400 33315 85286400 user@host> show task memory detail | match "RT_NEXTHOPS_TEMPLATE|RT_TEMPLATE_BOOK_KEE" RT_NEXTHOPS_TEMPLATE 1008 1024 T 50 51200 50 51200 RT_NEXTHOPS_TEMPLATE 688 768 T 50 38400 50 38400 RT_NEXTHOPS_TEMPLATE 368 384 T 419005 160897920 419005 160897920 <=== RT_TEMPLATE_BOOK_KEE 2064 2560 T 39975 102336000 39975 10233600 <=== This issue affects: Juniper Networks Junos OS All versions prior to 19.3R3-S7; 19.4 versions prior to 19.4R2-S8, 19.4R3-S9; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S4; 21.1 versions prior to 21.1R3-S3; 21.2 versions prior to 21.2R3-S2; 21.3 versions prior to 21.3R3-S1; 21.4 versions prior to 21.4R2-S1, 21.4R3; 22.1 versions prior to 22.1R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R3-S4-EVO; 21.4 versions prior to 21.4R2-S1-EVO, 21.4R3-EVO; 22.1 versions prior to 22.1R2-EVO.

  • Published: Jan 13, 2023
  • Updated: Nov 16, 2025
  • CVE: CVE-2023-22406
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 6.5
  • AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWEs:

Software From Fixed in
juniper / junos 19.3 19.3.x
juniper / junos 19.3-r1 19.3-r1.x
juniper / junos 19.4-r1 19.4-r1.x
juniper / junos 19.3-r2 19.3-r2.x
juniper / junos 19.3-r2-s1 19.3-r2-s1.x
juniper / junos 19.3-r1-s1 19.3-r1-s1.x
juniper / junos 19.4-r1-s1 19.4-r1-s1.x
juniper / junos 19.3-r2-s2 19.3-r2-s2.x
juniper / junos 19.4-r1-s2 19.4-r1-s2.x
juniper / junos 20.2-r1 20.2-r1.x
juniper / junos 19.4-r2 19.4-r2.x
juniper / junos 19.4-r2-s1 19.4-r2-s1.x
juniper / junos 19.3-r2-s3 19.3-r2-s3.x
juniper / junos 19.3-r2-s4 19.3-r2-s4.x
juniper / junos 20.2-r1-s1 20.2-r1-s1.x
juniper / junos 20.2-r1-s2 20.2-r1-s2.x
juniper / junos 19.4-r2-s2 19.4-r2-s2.x
juniper / junos 19.4-r3 19.4-r3.x
juniper / junos 19.3-r2-s5 19.3-r2-s5.x
juniper / junos 19.3-r3 19.3-r3.x
juniper / junos 20.3-r1 20.3-r1.x
juniper / junos 20.3-r1-s1 20.3-r1-s1.x
juniper / junos 20.2-r1-s3 20.2-r1-s3.x
juniper / junos 19.4-r3-s1 19.4-r3-s1.x
juniper / junos 19.4-r2-s3 19.4-r2-s3.x
juniper / junos 20.2-r2 20.2-r2.x
juniper / junos 20.2-r2-s1 20.2-r2-s1.x
juniper / junos 19.4-r1-s3 19.4-r1-s3.x
juniper / junos 20.4-r1 20.4-r1.x
juniper / junos 20.2-r2-s2 20.2-r2-s2.x
juniper / junos 20.4-r1-s1 20.4-r1-s1.x
juniper / junos 20.2-r2-s3 20.2-r2-s3.x
juniper / junos 20.3-r2 20.3-r2.x
juniper / junos 19.3-r3-s1 19.3-r3-s1.x
juniper / junos 21.1-r1 21.1-r1.x
juniper / junos 20.4-r2 20.4-r2.x
juniper / junos 20.3-r2-s1 20.3-r2-s1.x
juniper / junos 20.2-r3 20.2-r3.x
juniper / junos 20.2-r3-s1 20.2-r3-s1.x
juniper / junos 19.4-r3-s2 19.4-r3-s2.x
juniper / junos 19.4-r3-s3 19.4-r3-s3.x
juniper / junos 19.4-r3-s4 19.4-r3-s4.x
juniper / junos 19.3-r3-s2 19.3-r3-s2.x
juniper / junos 21.2-r1 21.2-r1.x
juniper / junos 20.4-r2-s1 20.4-r2-s1.x
juniper / junos 21.1-r1-s1 21.1-r1-s1.x
juniper / junos 20.3-r3 20.3-r3.x
juniper / junos 19.4-r2-s4 19.4-r2-s4.x
juniper / junos 19.4-r3-s5 19.4-r3-s5.x
juniper / junos 19.4-r1-s4 19.4-r1-s4.x
juniper / junos 19.4-r2-s5 19.4-r2-s5.x
juniper / junos 20.2-r3-s2 20.2-r3-s2.x
juniper / junos 19.3-r3-s3 19.3-r3-s3.x
juniper / junos 21.2-r1-s1 21.2-r1-s1.x
juniper / junos 21.1-r2 21.1-r2.x
juniper / junos 19.4-r3-s6 19.4-r3-s6.x
juniper / junos 20.4-r3 20.4-r3.x
juniper / junos 19.3-r2-s6 19.3-r2-s6.x
juniper / junos 19.4 19.4.x
juniper / junos 19.3-r3-s4 19.3-r3-s4.x
juniper / junos 20.2-r3-s3 20.2-r3-s3.x
juniper / junos 20.3-r3-s1 20.3-r3-s1.x
juniper / junos 21.3-r1 21.3-r1.x
juniper / junos 21.3-r2 21.3-r2.x
juniper / junos 21.2-r2 21.2-r2.x
juniper / junos 20.4-r3-s1 20.4-r3-s1.x
juniper / junos 20.4-r2-s2 20.4-r2-s2.x
juniper / junos 21.1-r3 21.1-r3.x
juniper / junos 21.1-r2-s1 21.1-r2-s1.x
juniper / junos 21.2 21.2.x
juniper / junos 21.1 21.1.x
juniper / junos 20.4 20.4.x
juniper / junos 20.3 20.3.x
juniper / junos 20.2 20.2.x
juniper / junos 21.1-r2-s2 21.1-r2-s2.x
juniper / junos 21.2-r1-s2 21.2-r1-s2.x
juniper / junos 21.2-r2-s1 21.2-r2-s1.x
juniper / junos 21.2-r2-s2 21.2-r2-s2.x
juniper / junos 21.4-r1-s1 21.4-r1-s1.x
juniper / junos 21.3-r1-s1 21.3-r1-s1.x
juniper / junos 21.3-r1-s2 21.3-r1-s2.x
juniper / junos 21.4-r1 21.4-r1.x
juniper / junos 20.3-r3-s2 20.3-r3-s2.x
juniper / junos 21.3-r2-s1 21.3-r2-s1.x
juniper / junos 21.3-r2-s2 21.3-r2-s2.x
juniper / junos 21.4-r1-s2 21.4-r1-s2.x
juniper / junos 19.3-r3-s5 19.3-r3-s5.x
juniper / junos 19.4-r2-s6 19.4-r2-s6.x
juniper / junos 19.4-r3-s7 19.4-r3-s7.x
juniper / junos 20.2-r3-s4 20.2-r3-s4.x
juniper / junos 20.3-r1-s2 20.3-r1-s2.x
juniper / junos 20.3-r3-s3 20.3-r3-s3.x
juniper / junos 20.4-r3-s2 20.4-r3-s2.x
juniper / junos 21.1-r3-s1 21.1-r3-s1.x
juniper / junos 21.2-r3 21.2-r3.x
juniper / junos 22.1-r1 22.1-r1.x
juniper / junos 21.3-r3 21.3-r3.x
juniper / junos 21.4-r2 21.4-r2.x
juniper / junos 20.4-r3-s3 20.4-r3-s3.x
juniper / junos 21.4 21.4.x
juniper / junos 21.3 21.3.x
juniper / junos 21.1-r3-s2 21.1-r3-s2.x
juniper / junos 22.1-r1-s1 22.1-r1-s1.x
juniper / junos 19.4-r3-s8 19.4-r3-s8.x
juniper / junos 20.3-r3-s4 20.3-r3-s4.x
juniper / junos 19.3-r3-s6 19.3-r3-s6.x
juniper / junos 19.4-r2-s7 19.4-r2-s7.x
juniper / junos 21.2-r3-s1 21.2-r3-s1.x
juniper / junos - 19.3
juniper / junos_os_evolved 20.4-r1 20.4-r1.x
juniper / junos_os_evolved 20.4-r1-s1 20.4-r1-s1.x
juniper / junos_os_evolved 20.4-r1-s2 20.4-r1-s2.x
juniper / junos_os_evolved 20.4-r2 20.4-r2.x
juniper / junos_os_evolved 20.4-r2-s1 20.4-r2-s1.x
juniper / junos_os_evolved 20.4-r2-s2 20.4-r2-s2.x
juniper / junos_os_evolved 20.4-r2-s3 20.4-r2-s3.x
juniper / junos_os_evolved 20.4-r3 20.4-r3.x
juniper / junos_os_evolved 20.4-r3-s1 20.4-r3-s1.x
juniper / junos_os_evolved 20.4 20.4.x
juniper / junos_os_evolved - 20.4
juniper / junos_os_evolved 20.4-r3-s2 20.4-r3-s2.x
juniper / junos_os_evolved 21.4-r1 21.4-r1.x
juniper / junos_os_evolved 21.4-r1-s1 21.4-r1-s1.x
juniper / junos_os_evolved 21.4 21.4.x
juniper / junos_os_evolved 20.4-r3-s3 20.4-r3-s3.x
juniper / junos_os_evolved 22.1-r1 22.1-r1.x
juniper / junos_os_evolved 21.4-r2 21.4-r2.x
juniper / junos_os_evolved 22.1-r1-s1 22.1-r1-s1.x
juniper / junos_os_evolved 22.1-r1-s2 22.1-r1-s2.x
juniper / junos_os_evolved 21.4-r1-s2 21.4-r1-s2.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.