Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2026-33783 — juniper / junos_os_evolved

Function Call With Incorrect Argument Type

A Function Call With Incorrect Argument Type vulnerability in the sensor interface of Juniper Networks Junos OS Evolved on PTX Series allows a network-based, authenticated attacker with low privileges to cause a complete Denial of Service (DoS).

If colored SRTE policy tunnels are provisioned via PCEP, and gRPC is used to monitor traffic in these tunnels, evo-aftmand crashes and doesn't restart which leads to a complete and persistent service impact. The system has to be manually restarted to recover. The issue is seen only when the Originator ASN field in PCEP contains a value larger than 65,535 (32-bit ASN). The issue is not reproducible when SRTE policy tunnels are statically configured.

This issue affects Junos OS Evolved on PTX Series: 

  • all versions before 22.4R3-S9-EVO,
  • 23.2 versions before 23.2R2-S6-EVO,
  • 23.4 versions before 23.4R2-S7-EVO,
  • 24.2 versions before 24.2R2-S4-EVO,
  • 24.4 versions before 24.4R2-S2-EVO,
  • 25.2 versions before 25.2R1-S2-EVO, 25.2R2-EVO.
  • Published: Apr 9, 2026
  • Updated: Apr 10, 2026
  • CVE: CVE-2026-33783
  • Severity: Medium
  • Exploit:

CVSS v3:

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

CWEs:

Software From Fixed in
juniper / junos_os_evolved - 22.4
juniper / junos_os_evolved 22.4 22.4.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 22.4-r2-s1 22.4-r2-s1.x
juniper / junos_os_evolved 22.4-r2-s2 22.4-r2-s2.x
juniper / junos_os_evolved 22.4-r3 22.4-r3.x
juniper / junos_os_evolved 22.4-r3-s1 22.4-r3-s1.x
juniper / junos_os_evolved 22.4-r3-s2 22.4-r3-s2.x
juniper / junos_os_evolved 22.4-r3-s3 22.4-r3-s3.x
juniper / junos_os_evolved 22.4-r3-s4 22.4-r3-s4.x
juniper / junos_os_evolved 22.4-r3-s5 22.4-r3-s5.x
juniper / junos_os_evolved 22.4-r3-s6 22.4-r3-s6.x
juniper / junos_os_evolved 22.4-r3-s7 22.4-r3-s7.x
juniper / junos_os_evolved 23.2 23.2.x
juniper / junos_os_evolved 23.2-r1 23.2-r1.x
juniper / junos_os_evolved 23.2-r1-s1 23.2-r1-s1.x
juniper / junos_os_evolved 23.2-r1-s2 23.2-r1-s2.x
juniper / junos_os_evolved 23.2-r2 23.2-r2.x
juniper / junos_os_evolved 23.2-r2-s1 23.2-r2-s1.x
juniper / junos_os_evolved 23.2-r2-s2 23.2-r2-s2.x
juniper / junos_os_evolved 23.2-r2-s3 23.2-r2-s3.x
juniper / junos_os_evolved 23.2-r2-s4 23.2-r2-s4.x
juniper / junos_os_evolved 23.2-r2-s5 23.2-r2-s5.x
juniper / junos_os_evolved 23.4 23.4.x
juniper / junos_os_evolved 23.4-r1 23.4-r1.x
juniper / junos_os_evolved 23.4-r1-s1 23.4-r1-s1.x
juniper / junos_os_evolved 23.4-r1-s2 23.4-r1-s2.x
juniper / junos_os_evolved 23.4-r2 23.4-r2.x
juniper / junos_os_evolved 23.4-r2-s1 23.4-r2-s1.x
juniper / junos_os_evolved 23.4-r2-s2 23.4-r2-s2.x
juniper / junos_os_evolved 23.4-r2-s3 23.4-r2-s3.x
juniper / junos_os_evolved 23.4-r2-s4 23.4-r2-s4.x
juniper / junos_os_evolved 23.4-r2-s5 23.4-r2-s5.x
juniper / junos_os_evolved 23.4-r2-s6 23.4-r2-s6.x
juniper / junos_os_evolved 24.2 24.2.x
juniper / junos_os_evolved 24.2-r1 24.2-r1.x
juniper / junos_os_evolved 24.2-r1-s2 24.2-r1-s2.x
juniper / junos_os_evolved 24.2-r2 24.2-r2.x
juniper / junos_os_evolved 24.2-r2-s1 24.2-r2-s1.x
juniper / junos_os_evolved 24.2-r2-s2 24.2-r2-s2.x
juniper / junos_os_evolved 24.2-r2-s3 24.2-r2-s3.x
juniper / junos_os_evolved 24.4 24.4.x
juniper / junos_os_evolved 24.4-r1 24.4-r1.x
juniper / junos_os_evolved 24.4-r1-s2 24.4-r1-s2.x
juniper / junos_os_evolved 24.4-r1-s3 24.4-r1-s3.x
juniper / junos_os_evolved 24.4-r2 24.4-r2.x
juniper / junos_os_evolved 24.4-r2-s1 24.4-r2-s1.x
juniper / junos_os_evolved 25.2 25.2.x
juniper / junos_os_evolved 25.2-r1 25.2-r1.x
juniper / junos_os_evolved 25.2-r1-s1 25.2-r1-s1.x
juniper / junos_os_evolved 25.2-r2 25.2-r2.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.