CVE-2026-33783: A Function Call With Incorrect Argument Type vulnerability in the sensor interface of Juniper Networks Junos OS…

CVE-2026-33783 · Severity: medium · CVSS 6.5 · Published 2026-04-09

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.

Technologies: Juniper Junos Os Evolved. Vendors: Juniper.

Quick answers

Is CVE-2026-33783 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33783 being exploited in the wild.
How severe is CVE-2026-33783?
Medium severity, with a CVSS score of 6.5, published 9 April 2026.
Which products and versions are affected?
Juniper Junos Os Evolved, Juniper Ptx10001-36mr, Juniper Ptx10002-36qdd, Juniper Ptx10003 and 4 more. The advisory does not name versions.
Is there a fix for CVE-2026-33783?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-33783?
Check whether you run Juniper Junos Os Evolved, Juniper Ptx10001-36mr, Juniper Ptx10002-36qdd or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Juniper Junos Os Evolved
  • Juniper Ptx10001-36mr
  • Juniper Ptx10002-36qdd
  • Juniper Ptx10003
  • Juniper Ptx10004
  • Juniper Ptx10008
  • Juniper Ptx10016
  • Juniper Ptx12008

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