CVE-2023-36836

Junos OS and Junos OS Evolved: In a MoFRR scenario an rpd core may be observed when a low privileged CLI command is executed

MEDIUM

4.7

CVSS Score

Published: July 14, 2023 at 05:33 PM UTC

Updated: June 17, 2026 at 06:07 AM UTC

3 products affected across 2 vendorsJunosJunos OS EvolvedJunos OS Evolved

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Severity

MEDIUM4.7

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

A Use of an Uninitialized Resource vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, authenticated attacker with low privileges to cause a Denial of Service (DoS). On all Junos OS and Junos OS Evolved platforms, in a Multicast only Fast Reroute (MoFRR) scenario, the rpd process can crash when a a specific low privileged CLI command is executed. The rpd crash will impact all routing protocols until the process has automatically been restarted. As the operational state which makes this issue exploitable is outside the attackers control, this issue is considered difficult to exploit. Continued execution of this command will lead to a sustained DoS. This issue affects: Juniper Networks Junos OS 19.4 version 19.4R3-S5 and later versions prior to 19.4R3-S9; 20.1 version 20.1R2 and later versions; 20.2 versions prior to 20.2R3-S7; 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S6; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3-S2; 21.3 versions prior to 21.3R3-S1; 21.4 versions prior to 21.4R3; 22.1 versions prior to 22.1R1-S2, 22.1R2; 22.2 versions prior to 22.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R3-S6-EVO; 21.1-EVO version 21.1R1-EVO and later versions; 21.2-EVO version 21.2R1-EVO and later versions; 21.3-EVO versions prior to 21.3R3-S1-EVO; 21.4-EVO versions prior to 21.4R3-EVO; 22.1-EVO versions prior to 22.1R1-S2-EVO, 22.1R2-EVO; 22.2-EVO versions prior to 22.2R2-EVO.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved · Juniper

95%

Affected range stops below 20.4, so it looks safe — our inference, not a vendor statement

Junos · Juniper Networks

95%

19.4R3-S4 ≤ v < 19.4*20.1R2 ≤ v < 20.1*20.2 ≤ v < 20.2R3-S720.3 ≤ v < 20.3R3-S520.4 ≤ v < 20.4R3-S621.1 ≤ v < 21.1R3-S421.2 ≤ v < 21.2R3-S221.3 ≤ v < 21.3R3-S121.4 ≤ v < 21.4R322.1 ≤ v < 22.1R1-S2, 22.1R222.2 ≤ v < 22.2R219.4 19.4 r1 19.4 r1-s1 19.4 r1-s2 19.4 r1-s3 19.4 r1-s4 19.4 r2 19.4 r2-s1 19.4 r2-s2 19.4 r2-s3 19.4 r2-s4 19.4 r2-s5 19.4 r2-s6 19.4 r2-s7 19.4 r3 19.4 r3-s1 19.4 r3-s10 19.4 r3-s11 19.4 r3-s12 19.4 r3-s2 19.4 r3-s3 19.4 r3-s4 19.4 r3-s5 19.4 r3-s6 19.4 r3-s7 19.4 r3-s8 19.4R3-S4 20.1 20.1 r1 20.1 r1-s1 20.1 r1-s2 20.1 r1-s3 20.1 r1-s4 20.1 r2 20.1 r2-s1 20.1 r2-s2 20.1 r3 20.1 r3-s1 20.1 r3-s2 20.1 r3-s3 20.1 r3-s4 20.1 r3-s5 20.1R2 20.2 20.2 r1 20.2 r1-s1 20.2 r1-s2 20.2 r1-s3 20.2 r2 20.2 r2-s1 20.2 r2-s2 20.2 r2-s3 20.2 r3 20.2 r3-s1 20.2 r3-s2 20.2 r3-s3 20.2 r3-s4 20.2 r3-s5 20.2 r3-s6 20.3 20.3 r1 20.3 r1-s1 20.3 r1-s2 20.3 r2 20.3 r2-s1 20.3 r3 20.3 r3-s1 20.3 r3-s2 20.3 r3-s3 20.3 r3-s4 20.4 20.4 r1 20.4 r1-s1 20.4 r2 20.4 r2-s1 20.4 r2-s2 20.4 r3 20.4 r3-s1 20.4 r3-s2 20.4 r3-s3 20.4 r3-s4 20.4 r3-s5 21.1 21.1 r1 21.1 r1-s1 21.1 r2 21.1 r2-s1 21.1 r2-s2 21.1 r3 21.1 r3-s1 21.1 r3-s2 21.1 r3-s3 21.2 21.2 r1 21.2 r1-s1 21.2 r1-s2 21.2 r2 21.2 r2-s1 21.2 r2-s2 21.2 r3 21.2 r3-s1 21.3 21.3 r1 21.3 r1-s1 21.3 r1-s2 21.3 r2 21.3 r2-s1 21.3 r2-s2 21.3 r3 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 22.1 22.1 r1 22.1 r1-s1 22.2 22.2 r1 22.2 r1-s1 22.2 r1-s2

Affected range stops below 19.4*, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.1*, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.2R3-S7, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.3R3-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.4R3-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.1R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R3-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.3R3-S1, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R1-S2, 22.1R2, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R2, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

60%

v < 20.4R3-S6-EVO21.1 ≤ v < 21.1*21.2 ≤ v < 21.2*21.3 ≤ v < 21.3R3-S1-EVO21.4 ≤ v < 21.4R3-EVO22.1 ≤ v < 22.1R1-S2-EVO, 22.1R2-EVO22.2 ≤ v < 22.2R2-EVO21.1 21.2 21.3 21.4 22.1 22.2

Affected range stops below 20.4R3-S6-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.1*, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2*, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.3R3-S1-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R1-S2-EVO, 22.1R2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://supportportal.juniper.net/JSA71643

References (1)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA71643

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.7MEDIUMjuniper

Attack Vector: LOCAL
Complexity: HIGH
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-908

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