CVE detail

CVE-2024-21591 — CVE-2024-21591

Published 2024-01-12 · Modified 2026-06-17 · Vendor juniper · Product junos · Source nvd
CRITICAL
severity
CVSS-derived band
9.8
CVSS v3
0–10 scale
0.1767
EPSS probability
exploitation probability, 30d
97.0%
EPSS percentile
percentile vs all CVEs
NOT LISTED
CISA KEV
known exploited catalog

Description

An Out-of-bounds Write vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS), or Remote Code Execution (RCE) and obtain root privileges on the device. This issue is caused by use of an insecure function allowing an attacker to overwrite arbitrary memory. This issue affects Juniper Networks Junos OS SRX Series and EX Series: * Junos OS versions earlier than 20.4R3-S9; * Junos OS 21.2 versions earlier than 21.2R3-S7; * Junos OS 21.3 versions earlier than 21.3R3-S5; * Junos OS 21.4 versions earlier than 21.4R3-S5; * Junos OS 22.1 versions earlier than 22.1R3-S4; * Junos OS 22.2 versions earlier than 22.2R3-S3; * Junos OS 22.3 versions earlier than 22.3R3-S2

Remediation

vendor remediation guidance

The following software releases have been updated to resolve this specific issue: Junos OS: 20.4R3-S9, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S3, 22.3R3-S2, 22.4R2-S2, 22.4R3, 23.2R1-S1, 23.2R2, 23.4R1, and all subsequent releases.

workarounds

Disable J-Web, or limit access to only trusted hosts.

ProductVulnerable rangeFixed versionAdvisory
Juniper Networks Junos OS<20.4R3-S920.4R3-S9advisory ↗
Juniper Networks Junos OS>=21.2<21.2R3-S721.2R3-S7advisory ↗
Juniper Networks Junos OS>=21.3<21.3R3-S521.3R3-S5advisory ↗
Juniper Networks Junos OS>=21.4<21.4R3-S521.4R3-S5advisory ↗
Juniper Networks Junos OS>=22.1<22.1R3-S422.1R3-S4advisory ↗
Juniper Networks Junos OS>=22.2<22.2R3-S322.2R3-S3advisory ↗
Juniper Networks Junos OS>=22.3<22.3R3-S222.3R3-S2advisory ↗
Juniper Networks Junos OS>=22.4<22.4R2-S2, 22.4R322.4R2-S2, 22.4R3advisory ↗

References

cvedb.io · NVD · CISA KEV · FIRST EPSS · vendor advisories (CVE Program List v5). Informational only, no warranty — verify every remediation against the vendor advisory before acting on it. This product uses data from the NVD API but is not endorsed or certified by the NVD, CISA, FIRST.org or any vendor named. CVE® is a registered trademark of The MITRE Corporation.