Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2023-0026 — juniper / junos

Improper Input Validation

An Improper Input Validation vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). When a BGP update message is received over an established BGP session, and that message contains a specific, optional transitive attribute, this session will be torn down with an update message error. This issue cannot propagate beyond an affected system as the processing error occurs as soon as the update is received. This issue is exploitable remotely as the respective attribute can propagate through unaffected systems and intermediate AS (if any). Continuous receipt of a BGP update containing this attribute will create a sustained Denial of Service (DoS) condition. Some customers have experienced these BGP session flaps which prompted Juniper SIRT to release this advisory out of cycle before fixed releases are widely available as there is an effective workaround.

This issue affects: Juniper Networks Junos OS 15.1R1 and later versions prior to 20.4R3-S8; 21.1 version 21.1R1 and later versions prior to 21.2R3-S6; 21.3 versions prior to 21.3R3-S5; 21.4 versions prior to 21.4R3-S4; 22.1 versions prior to 22.1R3-S4; 22.2 versions prior to 22.2R3-S2; 22.3 versions prior to 22.3R2-S2, 22.3R3-S1; 22.4 versions prior to 22.4R2-S1, 22.4R3; 23.1 versions prior to 23.1R1-S1, 23.1R2.

Juniper Networks Junos OS Evolved All versions prior to 20.4R3-S8-EVO; 21.1 version 21.1R1-EVO and later versions prior to 21.2R3-S6-EVO; 21.3 versions prior to 21.3R3-S5-EVO; 21.4 versions prior to 21.4R3-S4-EVO; 22.1 versions prior to 22.1R3-S4-EVO; 22.2 versions prior to 22.2R3-S2-EVO; 22.3 versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO; 22.4 versions prior to 22.4R2-S1-EVO, 22.4R3-EVO; 23.1 versions prior to 23.1R1-S1-EVO, 23.1R2-EVO.

  • Published: Jun 21, 2023
  • Updated: Feb 26, 2026
  • CVE: CVE-2023-0026
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWEs:

Software From Fixed in
juniper / junos 20.4-r1 20.4-r1.x
juniper / junos 20.4-r1-s1 20.4-r1-s1.x
juniper / junos 21.1-r1 21.1-r1.x
juniper / junos 20.4-r2 20.4-r2.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 21.2-r1-s1 21.2-r1-s1.x
juniper / junos 21.1-r2 21.1-r2.x
juniper / junos 20.4-r3 20.4-r3.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 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 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 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 21.3-r3-s1 21.3-r3-s1.x
juniper / junos 21.4-r2 21.4-r2.x
juniper / junos 21.4-r2-s1 21.4-r2-s1.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 22.1-r2 22.1-r2.x
juniper / junos 21.4-r3 21.4-r3.x
juniper / junos 22.1-r1-s2 22.1-r1-s2.x
juniper / junos 22.1-r2-s2 22.1-r2-s2.x
juniper / junos 21.4-r2-s2 21.4-r2-s2.x
juniper / junos 22.2-r1 22.2-r1.x
juniper / junos 22.2-r1-s1 22.2-r1-s1.x
juniper / junos 20.4-r3-s4 20.4-r3-s4.x
juniper / junos 21.2-r3-s2 21.2-r3-s2.x
juniper / junos 21.2-r3-s1 21.2-r3-s1.x
juniper / junos 22.3-r1 22.3-r1.x
juniper / junos 21.1-r3-s3 21.1-r3-s3.x
juniper / junos 22.2-r2 22.2-r2.x
juniper / junos 22.1-r3-s1 22.1-r3-s1.x
juniper / junos 21.1-r3-s4 21.1-r3-s4.x
juniper / junos 21.3-r3-s2 21.3-r3-s2.x
juniper / junos 22.3-r2 22.3-r2.x
juniper / junos 22.1-r3 22.1-r3.x
juniper / junos 20.4-r3-s5 20.4-r3-s5.x
juniper / junos 22.2-r1-s2 22.2-r1-s2.x
juniper / junos 21.4-r3-s1 21.4-r3-s1.x
juniper / junos 22.2-r2-s1 22.2-r2-s1.x
juniper / junos 22.1-r2-s1 22.1-r2-s1.x
juniper / junos 21.2-r3-s3 21.2-r3-s3.x
juniper / junos 21.3-r3-s3 21.3-r3-s3.x
juniper / junos 21.4-r3-s2 21.4-r3-s2.x
juniper / junos 20.4-r3-s6 20.4-r3-s6.x
juniper / junos 22.3-r1-s1 22.3-r1-s1.x
juniper / junos 22.4-r1 22.4-r1.x
juniper / junos 21.3-r3-s4 21.3-r3-s4.x
juniper / junos 21.4-r3-s3 21.4-r3-s3.x
juniper / junos 22.1-r3-s2 22.1-r3-s2.x
juniper / junos 22.2-r2-s2 22.2-r2-s2.x
juniper / junos 22.2-r3 22.2-r3.x
juniper / junos 22.3-r1-s2 22.3-r1-s2.x
juniper / junos 22.4-r1-s1 22.4-r1-s1.x
juniper / junos 22.4-r1-s2 22.4-r1-s2.x
juniper / junos 20.4-r3-s7 20.4-r3-s7.x
juniper / junos 21.1-r3-s5 21.1-r3-s5.x
juniper / junos 21.2-r3-s4 21.2-r3-s4.x
juniper / junos 22.3-r2-s1 22.3-r2-s1.x
juniper / junos 22.4-r2 22.4-r2.x
juniper / junos 22.2-r3-s1 22.2-r3-s1.x
juniper / junos 22.1-r3-s3 22.1-r3-s3.x
juniper / junos 21.2-r3-s5 21.2-r3-s5.x
juniper / junos 15.1 20.4
juniper / junos_os_evolved 20.4-r1 20.4-r1.x
juniper / junos_os_evolved 21.1-r1 21.1-r1.x
juniper / junos_os_evolved 21.1-r2 21.1-r2.x
juniper / junos_os_evolved 21.1-r1-s1 21.1-r1-s1.x
juniper / junos_os_evolved 21.2-r1 21.2-r1.x
juniper / junos_os_evolved 21.2-r1-s1 21.2-r1-s1.x
juniper / junos_os_evolved 21.2-r2 21.2-r2.x
juniper / junos_os_evolved 21.1 21.1.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 21.3-r1 21.3-r1.x
juniper / junos_os_evolved 20.4 20.4.x
juniper / junos_os_evolved 21.2 21.2.x
juniper / junos_os_evolved 21.2-r1-s2 21.2-r1-s2.x
juniper / junos_os_evolved 21.2-r2-s1 21.2-r2-s1.x
juniper / junos_os_evolved 21.3-r1-s1 21.3-r1-s1.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 21.2-r2-s2 21.2-r2-s2.x
juniper / junos_os_evolved 21.1-r3 21.1-r3.x
juniper / junos_os_evolved 21.2-r3 21.2-r3.x
juniper / junos_os_evolved 21.3-r2 21.3-r2.x
juniper / junos_os_evolved 21.3 21.3.x
juniper / junos_os_evolved 21.4 21.4.x
juniper / junos_os_evolved 21.1-r3-s1 21.1-r3-s1.x
juniper / junos_os_evolved 20.4-r3-s4 20.4-r3-s4.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 21.3-r2-s1 21.3-r2-s1.x
juniper / junos_os_evolved 21.3-r2-s2 21.3-r2-s2.x
juniper / junos_os_evolved 21.4-r2 21.4-r2.x
juniper / junos_os_evolved 21.4-r2-s1 21.4-r2-s1.x
juniper / junos_os_evolved 21.4-r2-s2 21.4-r2-s2.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
juniper / junos_os_evolved 22.2-r1-s1 22.2-r1-s1.x
juniper / junos_os_evolved 22.2-r1 22.2-r1.x
juniper / junos_os_evolved 21.2-r3-s1 21.2-r3-s1.x
juniper / junos_os_evolved 21.3-r3 21.3-r3.x
juniper / junos_os_evolved 20.4-r3-s5 20.4-r3-s5.x
juniper / junos_os_evolved 22.3-r1 22.3-r1.x
juniper / junos_os_evolved 22.1-r2 22.1-r2.x
juniper / junos_os_evolved 21.4-r3 21.4-r3.x
juniper / junos_os_evolved 22.2-r2 22.2-r2.x
juniper / junos_os_evolved 21.2-r3-s2 21.2-r3-s2.x
juniper / junos_os_evolved 21.2-r3-s3 21.2-r3-s3.x
juniper / junos_os_evolved 21.1-r3-s2 21.1-r3-s2.x
juniper / junos_os_evolved 21.1-r3-s3 21.1-r3-s3.x
juniper / junos_os_evolved 21.2-r3-s4 21.2-r3-s4.x
juniper / junos_os_evolved 21.4-r3-s1 21.4-r3-s1.x
juniper / junos_os_evolved 21.4-r3-s2 21.4-r3-s2.x
juniper / junos_os_evolved 21.4-r3-s3 21.4-r3-s3.x
juniper / junos_os_evolved 20.4-r3-s6 20.4-r3-s6.x
juniper / junos_os_evolved 22.2-r2-s1 22.2-r2-s1.x
juniper / junos_os_evolved 21.3-r3-s1 21.3-r3-s1.x
juniper / junos_os_evolved 21.3-r3-s2 21.3-r3-s2.x
juniper / junos_os_evolved 21.3-r3-s3 21.3-r3-s3.x
juniper / junos_os_evolved 22.1-r2-s1 22.1-r2-s1.x
juniper / junos_os_evolved 22.1-r3 22.1-r3.x
juniper / junos_os_evolved 21.2-r3-s5 21.2-r3-s5.x
juniper / junos_os_evolved 21.3-r3-s4 21.3-r3-s4.x
juniper / junos_os_evolved 20.4-r3-s7 20.4-r3-s7.x
juniper / junos_os_evolved 22.1-r3-s1 22.1-r3-s1.x
juniper / junos_os_evolved 22.1-r3-s2 22.1-r3-s2.x
juniper / junos_os_evolved 22.2-r2-s2 22.2-r2-s2.x
juniper / junos_os_evolved 22.2-r3 22.2-r3.x
juniper / junos_os_evolved 22.3-r1-s1 22.3-r1-s1.x
juniper / junos_os_evolved 22.3-r1-s2 22.3-r1-s2.x
juniper / junos_os_evolved 22.3-r2 22.3-r2.x
juniper / junos_os_evolved 22.4-r1 22.4-r1.x
juniper / junos_os_evolved 22.4-r1-s1 22.4-r1-s1.x
juniper / junos_os_evolved 22.4-r1-s2 22.4-r1-s2.x
juniper / junos_os_evolved 22.4-r2 22.4-r2.x
juniper / junos_os_evolved 22.3-r2-s1 22.3-r2-s1.x
juniper / junos_os_evolved 22.2-r3-s1 22.2-r3-s1.x
juniper / junos_os_evolved 22.1-r3-s3 22.1-r3-s3.x
juniper / junos_os_evolved 23.1-r1 23.1-r1.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.