Buffer overflow in Juniper Junos
CVE-2024-21591
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; * Junos OS 22.4 versions earlier than 22.4R2-S2, 22.4R3.
Vulnerability class: Buffer Overflow
EPSS: 0.177 (96.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Juniper Junos — versions 20.4, 21.2, 21.3
- Juniper Networks Junos Os — versions 0, 21.2, 21.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- sirt@juniper.net (vendor-advisory, Vendor Advisory)
- sirt@juniper.net (technical-description, Third Party Advisory)
- sirt@juniper.net (Exploit, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2024-21591?
- CVE-2024-21591 is a critical-severity vulnerability in Juniper Junos, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2024-01-12.
- How severe is CVE-2024-21591?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2024-21591 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.