Vulnerability in Juniper Junos
CVE-2021-0299
An Improper Handling of Exceptional Conditions vulnerability in the processing of a transit or directly received malformed IPv6 packet in Juniper Networks Junos OS results in a kernel crash, causing the device to restart, leading to 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 with IPv6 configured. Devices with only IPv4 configured are not vulnerable to this issue. This issue affects Juniper Networks Junos OS: 19.4 versions prior to 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S1, 20.2R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.4R1.
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 19.4, 20.1, 20.2
- Juniper Networks Junos OS — versions unspecified, 19.4, 20.1
Weakness classification (CWE)
References
- kb.juniper.net/JSA11213 (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-0299?
- CVE-2021-0299 is a high-severity vulnerability in Juniper Junos, classified under Improper Handling of Exceptional Conditions. CVSS score: 7.5/10. Published 2021-10-19.
- How severe is CVE-2021-0299?
- High severity. CVSS v3 base score is 7.5 out of 10.