CVE-2021-0239

In Juniper Networks Junos OS Evolved, receipt of a stream of specific genuine Layer 2 frames may cause the Advanced Forwarding Toolkit (AFT) manager process (Evo-aftmand), responsible for handling Route, Class-of-Service (CoS), Firewall operations within the packet forwarding engine (PFE) to crash and restart, leading to a Denial of Service (DoS) condition. By continuously sending this specific stream of genuine Layer 2 frames, an attacker can repeatedly crash the PFE, causing a sustained Denial of Service (DoS). This issue affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R1-EVO. This issue does not affect Junos OS versions.

CVSS v3 6.5 MEDIUM
CVSS v2.0 6.1 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

6.1^/10

CVSS v2.0 : MEDIUM

Vector : AV:A/AC:L/Au:N/C:N/I:N/A:C

Exploitability : 6.5 / Impact : 6.9

Access Vector ADJACENT_NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact COMPLETE

References

Link	Resource
https://kb.juniper.net/JSA11134	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:*

History

27 Apr 2021, 17:45

Type	Values Removed	Values Added
CWE		CWE-754
References	~~(MISC) https://kb.juniper.net/JSA11134 -~~	(MISC) https://kb.juniper.net/JSA11134 - Vendor Advisory
CPE		cpe:2.3:o:juniper:junos_os_evolved:20.4:r1::::::
CVSS	v2 : ~~unknown~~ v3 : ~~6.5~~	v2 : 6.1 v3 : 6.5

22 Apr 2021, 20:25

Type	Values Removed	Values Added
New CVE

Information

Published : 2021-04-22 20:15

Updated : 2023-12-10 13:55

NVD link : CVE-2021-0239

Mitre link : CVE-2021-0239

CVE.ORG link : CVE-2021-0239

JSON object : View

Products Affected

juniper

junos_os_evolved

CWE

CWE-754

Improper Check for Unusual or Exceptional Conditions

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