CVE-2023-36850
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
An Improper Validation of Specified Index, Position, or Offset in Input vulnerability in the Connectivity Fault Management (CFM) module of Juniper Networks Junos OS allows an adjacent attacker on the local broadcast domain to cause a Denial of Service (DoS) by sending malformed CFM packets.
Risk Assessment
This vulnerability can lead to sustained service outages, impacting the organization's operational continuity. Specifically, if CFM is not configured, an attacker can easily exploit this flaw.
Recommendation
It is recommended to update Junos OS to the latest version to mitigate this vulnerability. Additionally, configuring CFM can help minimize the risk of attack.
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Original NVD description (English source)
An Improper Validation of Specified Index, Position, or Offset in Input vulnerability in the Connectivity Fault Management(CFM) module of Juniper Networks Junos OS on MX Series(except MPC10, MPC11 and LC9600) allows an adjacent attacker on the local broadcast domain to cause a Denial of Service(DoS). Upon receiving a malformed CFM packet, the MPC crashes. Continued receipt of these packets causes a sustained denial of service. This issue can only be triggered when CFM hasn't been configured. This issue affects: Juniper Networks Junos OS All versions prior to 19.1R3-S10 on MX Series; 19.2 versions prior to 19.2R3-S7 on MX Series; 19.3 versions prior to 19.3R3-S8 on MX Series; 19.4 versions prior to 19.4R3-S12 on MX Series; 20.1 version 20.1R1 and later versions on MX Series; 20.2 versions prior to 20.2R3-S7 on MX Series; 20.3 version 20.3R1 and later versions on MX Series; 20.4 versions prior to 20.4R3-S7 on MX Series; 21.1 versions prior to 21.1R3-S5 on MX Series; 21.2 versions prior to 21.2R3-S4 on MX Series; 21.3 versions prior to 21.3R3-S4 on MX Series; 21.4 versions prior to 21.4R3-S3 on MX Series; 22.1 versions prior to 22.1R3-S2 on MX Series; 22.2 versions prior to 22.2R3 on MX Series; 22.3 versions prior to 22.3R2, 22.3R3 on MX Series; 22.4 versions prior to 22.4R2 on MX Series.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

