On Juniper Networks Junos OS devices, receipt of a malformed IPv6 packet may cause the system to crash and restart (vmcore). This issue can be trigged by a malformed IPv6 packet destined to the Routing Engine. An attacker can repeatedly send the offending packet resulting in an extended Denial of Service condition. Only IPv6 packets can trigger this issue. IPv4 packets cannot trigger this issue. This issue affects Juniper Networks Junos OS 18.4 versions prior to 18.4R2-S4, 18.4R3-S1; 19.1 versions prior to 19.1R2-S1, 19.1R3; 19.2 versions prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S4, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2. This issue does not affect Juniper Networks Junos OS prior to 18.4R1.
Published 2020-10-16 21:15:14
Updated 2022-10-19 17:21:45
View at NVD,   CVE.org
Vulnerability category: Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2020-1686

0.10%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 41 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-1686

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.8
HIGH AV:N/AC:L/Au:N/C:N/I:N/A:C
10.0
6.9
NIST
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
Juniper Networks, Inc.

CWE ids for CVE-2020-1686

  • The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.
    Assigned by: sirt@juniper.net (Secondary)

References for CVE-2020-1686

  • https://kb.juniper.net/JSA11083
    2020-10 Security Bulletin: Junos OS: Kernel crash (vmcore) upon receipt of a malformed IPv6 packet. (CVE-2020-1686) - Juniper Networks
    Vendor Advisory

Products affected by CVE-2020-1686

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