CVE-2024-39538

Junos OS Evolved: ACX7000 Series: When multicast traffic with a specific (S,G) is received evo-pfemand crashes

MEDIUM

6.5

CVSS Score

Published: July 11, 2024 at 04:14 PM UTC

Updated: June 17, 2026 at 07:42 AM UTC

2 products affected across 2 vendorsJunos OS EvolvedJunos OS Evolved

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

A Buffer Copy without Checking Size of Input vulnerability in the PFE management daemon (evo-pfemand) of Juniper Networks Junos OS Evolved on ACX7000 Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).When multicast traffic with a specific, valid (S,G) is received, evo-pfemand crashes which leads to an outage of the affected FPC until it is manually recovered. This issue affects Junos OS Evolved on ACX7000 Series: * All versions before 21.2R3-S8-EVO, * 21.4-EVO versions before 21.4R3-S7-EVO, * 22.2-EVO versions before 22.2R3-S4-EVO, * 22.3-EVO versions before 22.3R3-S3-EVO, * 22.4-EVO versions before 22.4R3-S2-EVO, * 23.2-EVO versions before 23.2R2-EVO, * 23.4-EVO versions before 23.4R1-S2-EVO, 23.4R2-EVO.

Affected

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

Junos OS Evolved · Juniper

95%

juniper-acx7020 (environment) · juniper-acx7024 (environment) · juniper-acx7024x (environment) · juniper-acx7100 (environment) · juniper-acx7300 (environment) · juniper-acx7509 (environment)

Junos OS Evolved · Juniper Networks

60%

v < 21.2R3-S8-EVO21.4-EVO ≤ v < 21.4R3-S7-EVO22.2-EVO ≤ v < 22.2R3-S4-EVO22.3-EVO ≤ v < 22.3R3-S3-EVO22.4-EVO ≤ v < 22.4R3-S2-EVO23.2-EVO ≤ v < 23.2R2-EVO23.4-EVO ≤ v < 23.4R1-S2-EVO, 23.4R2-EVO21.4-EVO 22.2-EVO 22.3-EVO 22.4-EVO 23.2-EVO 23.4-EVO

Affected range stops below 21.2R3-S8-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S7-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S4-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R3-S3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R3-S2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.4R1-S2-EVO, 23.4R2-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/JSA82998

References (1)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA82998

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

6.5MEDIUMjuniper

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

Vector?

Quick Info

StatusANALYZED

CWE

CWE-120

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