What is CVE-2024-39528?

CVE-2024-39528 is a medium-severity vulnerability in Juniper Junos, classified under Use After Free. CVSS score: 5.7/10. Published 2024-07-11.

How severe is CVE-2024-39528?

Medium severity. CVSS v3 base score is 5.7 out of 10.

Is CVE-2024-39528 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Use After Free in Juniper Junos

CVE-2024-39528

A Use After Free vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an authenticated, network-based attacker to cause a Denial of Service (DoS).On all Junos OS and Junos Evolved platforms, if a routing-instance deactivation is triggered, and at the same time a specific SNMP request is received, a segmentation fault occurs which causes rpd to crash and restart. This issue affects: Junos OS: * All versions before 21.2R3-S8, * 21.4 versions before 21.4R3-S5, * 22.2 versions before 22.2R3-S3, * 22.3 versions before 22.3R3-S2, * 22.4 versions before 22.4R3, * 23.2 versions before 23.2R2. Junos OS Evolved: * All versions before 21.2R3-S8-EVO, * 21.4-EVO versions before 21.4R3-S5-EVO, * 22.2-EVO versions before 22.2R3-S3-EVO, * 22.3-EVO versions before 22.3R3-S2-EVO, * 22.4-EVO versions before 22.4R3-EVO, * 23.2-EVO versions before 23.2R2-EVO.

Vulnerability class: Use-After-Free

Published 2024-07-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (24.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Juniper Junos — versions 21.2, 21.4, 22.2
Juniper Junos OS Evolved — versions 21.2, 21.4, 22.2
Juniper Networks Junos OS — versions 0, 21.4, 22.2
Juniper Networks Junos OS Evolved — versions 0, 21.4-EVO, 22.2-EVO

Weakness classification (CWE)

CWE-416 — Use After Free

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

supportportal.juniper.net/JSA82987 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2024-39528?: CVE-2024-39528 is a medium-severity vulnerability in Juniper Junos, classified under Use After Free. CVSS score: 5.7/10. Published 2024-07-11.
How severe is CVE-2024-39528?: Medium severity. CVSS v3 base score is 5.7 out of 10.
Is CVE-2024-39528 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.