Buffer overflow in Juniper Junos
CVE-2021-31383
In Point to MultiPoint (P2MP) scenarios within established sessions between network or adjacent neighbors the improper use of a source to destination copy write operation combined with a Stack-based Buffer Overflow on certain specific packets processed by the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved sent by a remote unauthenticated network attacker causes the RPD to crash causing a Denial of Service (DoS). Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R1. Juniper Networks Junos OS Evolved 20.1 versions prior to 20.1R3-EVO; 20.2 versions prior to 20.2R3-EVO; 20.3 versions prior to 20.3R2-EVO.
Vulnerability class: Buffer Overflow
Published · last modified .
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: 0.010 (61.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Juniper Junos — versions 19.2, 19.3, 19.4
- Juniper Junos OS Evolved — versions 20.1, 20.2, 20.3
- Juniper Networks Junos OS — versions unspecified, 19.2, 19.3
- Juniper Networks Junos OS Evolved — versions 20.1, 20.2, 20.3
Weakness classification (CWE)
References
- kb.juniper.net/JSA11251 (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-31383?
- CVE-2021-31383 is a high-severity vulnerability in Juniper Junos, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2021-10-19.
- How severe is CVE-2021-31383?
- High severity. CVSS v3 base score is 7.5 out of 10.