What is CVE-2024-39516?

CVE-2024-39516 is a high-severity vulnerability in Juniper Junos, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2024-10-09.

How severe is CVE-2024-39516?

High severity. CVSS v3 base score is 7.5 out of 10.

Out-of-bounds Read in Juniper Junos

CVE-2024-39516

An Out-of-Bounds Read vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects systems configured in either of two ways: * systems with BGP traceoptions enabled * systems with BGP traffic engineering configured This issue can affect iBGP and eBGP with any address family configured. The specific attribute involved is non-transitive, and will not propagate across a network. This issue affects: Junos OS: * All versions before 21.4R3-S8, * 22.2 before 22.2R3-S5, * 22.3 before 22.3R3-S4, * 22.4 before 22.4R3-S3, * 23.2 before 23.2R2-S2, * 23.4 before 23.4R2; Junos OS Evolved: * All versions before 21.4R3-S8-EVO, * 22.2-EVO before 22.2R3-S5-EVO, * 22.3-EVO before 22.3R3-S4-EVO, * 22.4-EVO before 22.4R3-S3-EVO, * 23.2-EVO before 23.2R2-S2-EVO, * 23.4-EVO before 23.4R2-EVO.

Vulnerability class: Buffer Overflow

Published 2024-10-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (34.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Juniper Junos — versions 21.4, 22.2, 22.3
Juniper Junos OS Evolved — versions 21.4, 22.2, 22.3
Juniper Networks Junos OS — versions 0, 22.2, 22.3
Juniper Networks Junos OS Evolved — versions 0, 22.2-EVO, 22.3-EVO

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

supportportal.juniper.net/JSA88100 (vendor-advisory, Vendor Advisory)
www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/sta… (Technical Description, product)

Frequently asked questions

What is CVE-2024-39516?: CVE-2024-39516 is a high-severity vulnerability in Juniper Junos, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2024-10-09.
How severe is CVE-2024-39516?: High severity. CVSS v3 base score is 7.5 out of 10.