Medium [CVE-2026-33783] 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)
This medium-severity Juniper Networks advisory covers CVE-2026-33783 affecting Junos OS Evolved, Junos OS, Junos.
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Summary
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,
- 25.2 versions before 25.2R1-S2-EVO, 25.2R2-EVO.
- * all versions before 22
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 22.4R3-S9-EVO
- 23.2R2-S6-EVO
- 23.4R2-S7-EVO
- 24.2R2-S4-EVO
- 24.4R2-S2-EVO
- 25.2R1-S2-EVO
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: 22.4R3-S9-EVO, 23.2R2-S6-EVO, 23.4R2-S7-EVO, 24.2R2-S4-EVO, 24.4R2-S2-EVO, 25.2R1-S2-EVO. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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