CVE-2023-36843

/// Technical description

An Improper Handling of Inconsistent Special Elements vulnerability in the Junos Services Framework (jsf) module of Juniper Networks Junos OS allows an unauthenticated network based attacker to cause a crash in the Packet Forwarding Engine (pfe) and thereby resulting in a Denial of Service (DoS).

Upon receiving malformed SSL traffic, the PFE crashes. A manual restart will be needed to recover the device.

This issue only affects devices with Juniper Networks Advanced Threat Prevention (ATP) Cloud enabled with Encrypted Traffic Insights (configured via ‘security-metadata-streaming policy’).

This issue affects Juniper Networks Junos OS:

* All versions prior to 20.4R3-S8, 20.4R3-S9;

* 21.1 version 21.1R1 and later versions;

* 21.2 versions prior to 21.2R3-S6;

* 21.3 versions prior to 21.3R3-S5;

* 21.4 versions prior to 21.4R3-S5;

* 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;

* 22.4 versi

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References