Improper Check for Unusual or Exceptional Conditions in MX Series and Junos OS - CVE-2021-31351
Published: October 14, 2021
Vulnerability identifier: #VU57357
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-31351
CWE-ID: CWE-754
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper check for unusual or exceptional conditions in packet processing on the MS-MPC/MS-MIC. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
Affected software
MX Series
Junos OS
Junos OS
How to mitigate CVE-2021-31351
Install updates from vendor's website.
Junos OS - addressed in versions 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R3-S8, 19.1R3-S6, 19.2R1-S7, 19.2R3-S2, 19.3R2-S6, 19.3R3-S3, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1