# CVE-2023-36843

## Summary

- **CVE ID:** CVE-2023-36843
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-168
- **Published:** Oct 12, 2023
- **Last Modified:** Mar 13, 2026

## 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 versions prior to 22.4R2-S1, 22.4R3;

## Affected Products

- Juniper Networks — Junos OS (0)
- Juniper Networks — Junos OS (21.1R1)
- Juniper Networks — Junos OS (21.2)
- Juniper Networks — Junos OS (21.3)
- Juniper Networks — Junos OS (21.4)
- Juniper Networks — Junos OS (22.1)
- Juniper Networks — Junos OS (22.2)
- Juniper Networks — Junos OS (22.3)
- Juniper Networks — Junos OS (22.4)

## References

- [CNA](https://supportportal.juniper.net/JSA73174)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.09%
- **EPSS Percentile:** 24.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._