CVE-2023-36836

Routing-protocol interruption via uninitialized rpd resource

Published Jul 14, 2023 · Updated Oct 22, 2024

Use of an uninitialized resource in Juniper Networks Junos OS and Junos OS Evolved allows local users to crash rpd through the CLI. In a MoFRR operational state, rpd uses an uninitialized resource while processing a specific low-privileged CLI command and terminates, interrupting every routing protocol until automatic restart. A low-privileged authenticated session is required, the MoFRR state is outside attacker control, and repeated commands sustain the interruption.

CVSS severity4.7
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized resource in Juniper Networks Junos OS and Junos OS Evolved allows local users to crash rpd through the CLI. In a MoFRR operational state, rpd uses an uninitialized resource while processing a specific low-privileged CLI command and terminates, interrupting every routing protocol until automatic restart. A low-privileged authenticated session is required, the MoFRR state is outside attacker control, and repeated commands sustain the interruption.

The record

CVE
CVE-2023-36836
Published
Jul 14, 2023
Updated
Oct 22, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-908, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=21.1 <21.1* changes=[{"at":"21.1R1-EVO","status":"affected"}]
  2. Affected versionversion=21.2 <21.2* changes=[{"at":"21.2R1-EVO","status":"affected"}]
  3. Affected versionversion=21.3 <21.3R3-S1-EVO
  4. Affected versionversion=21.4 <21.4R3-EVO
  5. Affected versionversion=22.1 <22.1R1-S2-EVO, 22.1R2-EVO
  6. Affected versionversion=22.2 <22.2R2-EVO
  7. Affected versionversion=unspecified <20.4R3-S6-EVO

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.1 <21.1* changes=[{"at":"21.1R1-EVO","status":"affected"}]; version=21.2 <21.2* changes=[{"at":"21.2R1-EVO","status":"affected"}]; version=21.3 <21.3R3-S1-EVO; version=21.4 <21.4R3-EVO; version=22.1 <22.1R1-S2-EVO, 22.1R2-EVO; version=22.2 <22.2R2-EVO; version=unspecified <20.4R3-S6-EVO
Juniper Networks · Junos OSversion=19.4R3-S4 <19.4* changes=[{"at":"19.4R3-S9","status":"unaffected"}]; version=20.1R2 <20.1*; version=20.2 <20.2R3-S7; version=20.3 <20.3R3-S5; version=20.4 <20.4R3-S6; version=21.1 <21.1R3-S4; version=21.2 <21.2R3-S2; version=21.3 <21.3R3-S1; version=21.4 <21.4R3; version=22.1 <22.1R1-S2, 22.1R2; version=22.2 <22.2R2

Published CVSS scores

4.7Juniper Networks, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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