RCE in Juniper Junos
CVE-2021-0252
NFX Series devices using Juniper Networks Junos OS are susceptible to a local code execution vulnerability thereby allowing an attacker to elevate their privileges via the Junos Device Management Daemon (JDMD) process. This issue affects Juniper Networks Junos OS on NFX Series: 18.1 version 18.1R1 and later versions prior to 18.2R3-S5; 18.3 versions prior to 18.3R2-S4, 18.3R3-S3; 18.4 versions prior to 18.4R2-S5, 18.4R3-S4; 19.1 versions prior to 19.1R1-S3, 19.1R2; 19.2 versions prior to 19.2R1-S5, 19.2R2. This issue does not affect: Juniper Networks Junos OS versions prior to 18.1R1. This issue does not affect the JDMD as used by Junos Node Slicing such as External Servers use in conjunction with Junos Node Slicing and In-Chassis Junos Node Slicing on MX480, MX960, MX2008, MX2010, MX2020.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (45.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Juniper Junos — versions 18.1, 18.2, 18.3
- Juniper Nfx150
- Juniper Nfx250
- Juniper Nfx350
- Juniper Networks Junos OS — versions 18.1R1, 18.2, 18.3
Weakness classification (CWE)
References
- kb.juniper.net/JSA11145 (Vendor Advisory)
- github.com/orangecertcc/security-research/security/advisories/GHSA-gr7j-26pv-5v… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-0252?
- CVE-2021-0252 is a high-severity vulnerability in Juniper Junos, classified under Command Injection. CVSS score: 7.8/10. Published 2021-04-22.
- How severe is CVE-2021-0252?
- High severity. CVSS v3 base score is 7.8 out of 10.