Main Vulnerability Database Vulnerabilities #VU57436

Improper Check or Handling of Exceptional Conditions in Junos OS and Junos OS Evolved - CVE-2021-31353

Published: October 19, 2021

Vulnerability identifier: #VU57436

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-2021-31353

CWE-ID: CWE-703

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 or handling of exceptional conditions. A remote attacker can inject a specific BGP update and perform a denial of service (DoS) attack.

Affected software

Junos OS
Junos OS Evolved

How to mitigate CVE-2021-31353

Install updates from vendor's website.

Junos OS - addressed in versions 18.4R2-S9, 19.1R3-S7, 19.3R3-S3, 19.4R1-S4, 19.4R3-S4, 20.1R3, 20.2R3-S2, 20.3R3, 20.4R3, 21.1R2, 21.2R1, 21.2R2, 21.3R1
Junos OS Evolved - addressed in versions 20.4R2-S3-EVO, 20.4R3-EVO, 21.1R2-EVO, 21.2R2-EVO, 21.3R1-EVO

External References

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11218&cat=SIRT_1&actp=LIST

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