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Juniper CVE-2026-33783

| EUVD-2026-21201 HIGH
Function Call With Incorrect Argument Type (CWE-686)
2026-04-09 sirt@juniper.net GHSA-q83c-r2qf-fvp6
Denial Of Service Juniper
7.1
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

7
Re-analysis Queued
Apr 17, 2026 - 18:37 vuln.today
cvss_changed
Analysis Updated
Apr 16, 2026 - 05:59 EUVD-patch-fix
executive_summary
Re-analysis Queued
Apr 16, 2026 - 05:29 backfill_euvd_patch
patch_released
Patch available
Apr 16, 2026 - 05:29 EUVD
25.2R1-S2-EVO,24.4R2-S2-EVO,24.2R2-S4-EVO
EUVD ID Assigned
Apr 09, 2026 - 22:22 euvd
EUVD-2026-21201
Analysis Generated
Apr 09, 2026 - 22:22 vuln.today
CVE Published
Apr 09, 2026 - 22:16 nvd
HIGH 7.1

DescriptionNVD

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.

AnalysisAI

Complete persistent denial of service in Juniper Networks Junos OS Evolved on PTX Series routers allows authenticated, low-privilege network attackers to crash the evo-aftmand service with no automatic recovery. The vulnerability triggers when PCEP-provisioned colored SRTE policy tunnels with 32-bit ASN values (greater than 65,535) in the Originator ASN field are monitored via gRPC, causing permanent forwarding plane failure until manual system restart. …

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RemediationAI

Within 24 hours: Identify all PTX Series routers running Junos OS Evolved through version 25.2 and confirm whether PCEP-provisioned colored SRTE policies with 32-bit ASN values (>65,535) are in production. Within 7 days: Apply vendor-released patch to affected PTX Series systems; if unavailable for your specific release train, implement the compensating control below. …

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CVE-2026-33783 vulnerability details – vuln.today
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