CVE-2021-0259 Details

CVE-2021-0259

Published: 2021-04-22
Last Modified: 2021-05-04
CVE Author: NIST National Vulnerability Database
CVE Assigner: sirt@juniper.net
Summary

Due to a vulnerability in DDoS protection in Juniper Networks Junos OS and Junos OS Evolved on QFX5K Series switches in a VXLAN configuration, instability might be experienced in the underlay network as a consequence of exceeding the default ddos-protection aggregate threshold. If an attacker on a client device on the overlay network sends a high volume of specific, legitimate traffic in the overlay network, due to an improperly detected DDoS violation, the leaf might not process certain L2 traffic, sent by spines in the underlay network. Continued receipt and processing of the high volume traffic will sustain the Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on QFX5K Series: 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R2-S8, 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R1-S2, 20.3R2. Juniper Networks Junos OS Evolved on QFX5220: All versions prior to 20.3R2-EVO.

Analysis
Common Vulnerability Score System v2.0
Severity Low
Base Score 3.3/10
Exploit Score 6.5/10
Access Vector Adjacent_network
Access Complexity Low
Authentication None
Impact Score 2.9/10
Confidentiality Impact None
Availability Impact Partial
Integrity Impact None
Vector String AV:A/AC:L/Au:N/C:N/I:N/A:P
Common Vulnerability Score System v3.1
Severity High
Base Score 7.4/10
Exploit Score 2.8/10
Access Vector Adjacent_network
Access Complexity Low
Privileges Required None
Impact Score 4/10
Confidentiality Impact None
Availability Impact High
Integrity Impact None
Scope Changed
User Interaction None
Vector String CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Products Reported
CPE Vulnerable Start Excluding
References

https://kb.juniper.net/JSA11150

CVE ID
CVE-2021-0259
Published
2021-04-22
Modified
2021-05-04
CVSSv2.0
Low
CVSSv3.1
High
PCI Compliance
Pass
US-CERT Alert
No
CWE
CWE-755

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