An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) on Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause Denial of Service (DoS).
In an EVPN/VXLAN scenario, when a high amount specific Layer 2 packets are processed by the device, it can cause the Routing Protocol Daemon (rpd) to utilize all CPU resources which causes the device to hang. A manual restart of the rpd is required to restore services.
This issue affects both IPv4 and IPv6 implementations. This issue affects Junos OS: All versions earlier than 21.4R3-S7; 22.1 versions earlier than 22.1R3-S5; 22.2 versions earlier than 22.2R3-S3; 22.3 versions earlier than 22.3R3-S3; 22.4 versions earlier than 22.4R3-S2; 23.2 versions earlier than 23.2R2; 23.4 versions earlier than 23.4R1-S1.
Junos OS Evolved: All versions earlier than 21.4R3-S7-EVO; 22.1-EVO versions earlier than 22.1R3-S5-EVO; 22.2-EVO versions earlier than 22.2R3-S3-EVO; 22.3-EVO versions earlier than 22.3R3-S3-EVO; 22.4-EVO versions earlier than 22.4R3-S2-EVO; 23.2-EVO versions earlier than 23.2R2-EVO; 23.4-EVO versions earlier than 23.4R1-S1-EVO, 23.4R2-EVO.
The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
Name | Vendor | Start Version | End Version |
---|---|---|---|
Junos | Juniper | * | 21.4 (excluding) |
Junos | Juniper | 21.4 (including) | 21.4 (including) |
Junos | Juniper | 21.4-r1 (including) | 21.4-r1 (including) |
Junos | Juniper | 21.4-r1-s1 (including) | 21.4-r1-s1 (including) |
Junos | Juniper | 21.4-r1-s2 (including) | 21.4-r1-s2 (including) |
Junos | Juniper | 21.4-r2 (including) | 21.4-r2 (including) |
Junos | Juniper | 21.4-r2-s1 (including) | 21.4-r2-s1 (including) |
Junos | Juniper | 21.4-r2-s2 (including) | 21.4-r2-s2 (including) |
Junos | Juniper | 21.4-r3 (including) | 21.4-r3 (including) |
Junos | Juniper | 21.4-r3-s1 (including) | 21.4-r3-s1 (including) |
Junos | Juniper | 21.4-r3-s2 (including) | 21.4-r3-s2 (including) |
Junos | Juniper | 21.4-r3-s3 (including) | 21.4-r3-s3 (including) |
Junos | Juniper | 21.4-r3-s4 (including) | 21.4-r3-s4 (including) |
Junos | Juniper | 21.4-r3-s5 (including) | 21.4-r3-s5 (including) |
Junos | Juniper | 21.4-r3-s6 (including) | 21.4-r3-s6 (including) |
Junos | Juniper | 22.1 (including) | 22.1 (including) |
Junos | Juniper | 22.1-r1 (including) | 22.1-r1 (including) |
Junos | Juniper | 22.1-r1-s1 (including) | 22.1-r1-s1 (including) |
Junos | Juniper | 22.1-r1-s2 (including) | 22.1-r1-s2 (including) |
Junos | Juniper | 22.1-r2 (including) | 22.1-r2 (including) |
Junos | Juniper | 22.1-r2-s1 (including) | 22.1-r2-s1 (including) |
Junos | Juniper | 22.1-r2-s2 (including) | 22.1-r2-s2 (including) |
Junos | Juniper | 22.1-r3 (including) | 22.1-r3 (including) |
Junos | Juniper | 22.1-r3-s1 (including) | 22.1-r3-s1 (including) |
Junos | Juniper | 22.1-r3-s2 (including) | 22.1-r3-s2 (including) |
Junos | Juniper | 22.1-r3-s3 (including) | 22.1-r3-s3 (including) |
Junos | Juniper | 22.1-r3-s4 (including) | 22.1-r3-s4 (including) |
Junos | Juniper | 22.2 (including) | 22.2 (including) |
Junos | Juniper | 22.2-r1 (including) | 22.2-r1 (including) |
Junos | Juniper | 22.2-r1-s1 (including) | 22.2-r1-s1 (including) |
Junos | Juniper | 22.2-r1-s2 (including) | 22.2-r1-s2 (including) |
Junos | Juniper | 22.2-r2 (including) | 22.2-r2 (including) |
Junos | Juniper | 22.2-r2-s1 (including) | 22.2-r2-s1 (including) |
Junos | Juniper | 22.2-r2-s2 (including) | 22.2-r2-s2 (including) |
Junos | Juniper | 22.2-r3 (including) | 22.2-r3 (including) |
Junos | Juniper | 22.2-r3-s1 (including) | 22.2-r3-s1 (including) |
Junos | Juniper | 22.2-r3-s2 (including) | 22.2-r3-s2 (including) |
Junos | Juniper | 22.3 (including) | 22.3 (including) |
Junos | Juniper | 22.3-r1 (including) | 22.3-r1 (including) |
Junos | Juniper | 22.3-r1-s1 (including) | 22.3-r1-s1 (including) |
Junos | Juniper | 22.3-r1-s2 (including) | 22.3-r1-s2 (including) |
Junos | Juniper | 22.3-r2 (including) | 22.3-r2 (including) |
Junos | Juniper | 22.3-r2-s1 (including) | 22.3-r2-s1 (including) |
Junos | Juniper | 22.3-r2-s2 (including) | 22.3-r2-s2 (including) |
Junos | Juniper | 22.3-r3 (including) | 22.3-r3 (including) |
Junos | Juniper | 22.3-r3-s1 (including) | 22.3-r3-s1 (including) |
Junos | Juniper | 22.3-r3-s2 (including) | 22.3-r3-s2 (including) |
Junos | Juniper | 22.4 (including) | 22.4 (including) |
Junos | Juniper | 22.4-r1 (including) | 22.4-r1 (including) |
Junos | Juniper | 22.4-r1-s1 (including) | 22.4-r1-s1 (including) |
Junos | Juniper | 22.4-r1-s2 (including) | 22.4-r1-s2 (including) |
Junos | Juniper | 22.4-r2 (including) | 22.4-r2 (including) |
Junos | Juniper | 22.4-r2-s1 (including) | 22.4-r2-s1 (including) |
Junos | Juniper | 22.4-r2-s2 (including) | 22.4-r2-s2 (including) |
Junos | Juniper | 22.4-r3 (including) | 22.4-r3 (including) |
Junos | Juniper | 22.4-r3-s1 (including) | 22.4-r3-s1 (including) |
Junos | Juniper | 23.2 (including) | 23.2 (including) |
Junos | Juniper | 23.2-r1 (including) | 23.2-r1 (including) |
Junos | Juniper | 23.2-r1-s1 (including) | 23.2-r1-s1 (including) |
Junos | Juniper | 23.2-r1-s2 (including) | 23.2-r1-s2 (including) |
Junos | Juniper | 23.4 (including) | 23.4 (including) |
Junos | Juniper | 23.4-r1 (including) | 23.4-r1 (including) |
Junos_os_evolved | Juniper | * | 21.4 (excluding) |
Junos_os_evolved | Juniper | 21.4 (including) | 21.4 (including) |
Junos_os_evolved | Juniper | 21.4-r1 (including) | 21.4-r1 (including) |
Junos_os_evolved | Juniper | 21.4-r1-s1 (including) | 21.4-r1-s1 (including) |
Junos_os_evolved | Juniper | 21.4-r1-s2 (including) | 21.4-r1-s2 (including) |
Junos_os_evolved | Juniper | 21.4-r2 (including) | 21.4-r2 (including) |
Junos_os_evolved | Juniper | 21.4-r2-s1 (including) | 21.4-r2-s1 (including) |
Junos_os_evolved | Juniper | 21.4-r2-s2 (including) | 21.4-r2-s2 (including) |
Junos_os_evolved | Juniper | 21.4-r3 (including) | 21.4-r3 (including) |
Junos_os_evolved | Juniper | 21.4-r3-s1 (including) | 21.4-r3-s1 (including) |
Junos_os_evolved | Juniper | 21.4-r3-s2 (including) | 21.4-r3-s2 (including) |
Junos_os_evolved | Juniper | 21.4-r3-s3 (including) | 21.4-r3-s3 (including) |
Junos_os_evolved | Juniper | 21.4-r3-s4 (including) | 21.4-r3-s4 (including) |
Junos_os_evolved | Juniper | 21.4-r3-s5 (including) | 21.4-r3-s5 (including) |
Junos_os_evolved | Juniper | 21.4-r3-s6 (including) | 21.4-r3-s6 (including) |
Junos_os_evolved | Juniper | 22.1 (including) | 22.1 (including) |
Junos_os_evolved | Juniper | 22.1-r1 (including) | 22.1-r1 (including) |
Junos_os_evolved | Juniper | 22.1-r1-s1 (including) | 22.1-r1-s1 (including) |
Junos_os_evolved | Juniper | 22.1-r1-s2 (including) | 22.1-r1-s2 (including) |
Junos_os_evolved | Juniper | 22.1-r2 (including) | 22.1-r2 (including) |
Junos_os_evolved | Juniper | 22.1-r2-s1 (including) | 22.1-r2-s1 (including) |
Junos_os_evolved | Juniper | 22.1-r3 (including) | 22.1-r3 (including) |
Junos_os_evolved | Juniper | 22.1-r3-s1 (including) | 22.1-r3-s1 (including) |
Junos_os_evolved | Juniper | 22.1-r3-s2 (including) | 22.1-r3-s2 (including) |
Junos_os_evolved | Juniper | 22.1-r3-s3 (including) | 22.1-r3-s3 (including) |
Junos_os_evolved | Juniper | 22.1-r3-s4 (including) | 22.1-r3-s4 (including) |
Junos_os_evolved | Juniper | 22.2 (including) | 22.2 (including) |
Junos_os_evolved | Juniper | 22.2-r1 (including) | 22.2-r1 (including) |
Junos_os_evolved | Juniper | 22.2-r1-s1 (including) | 22.2-r1-s1 (including) |
Junos_os_evolved | Juniper | 22.2-r1-s2 (including) | 22.2-r1-s2 (including) |
Junos_os_evolved | Juniper | 22.2-r2 (including) | 22.2-r2 (including) |
Junos_os_evolved | Juniper | 22.2-r2-s1 (including) | 22.2-r2-s1 (including) |
Junos_os_evolved | Juniper | 22.2-r2-s2 (including) | 22.2-r2-s2 (including) |
Junos_os_evolved | Juniper | 22.2-r3 (including) | 22.2-r3 (including) |
Junos_os_evolved | Juniper | 22.2-r3-s1 (including) | 22.2-r3-s1 (including) |
Junos_os_evolved | Juniper | 22.2-r3-s2 (including) | 22.2-r3-s2 (including) |
Junos_os_evolved | Juniper | 22.3 (including) | 22.3 (including) |
Junos_os_evolved | Juniper | 22.3-r1 (including) | 22.3-r1 (including) |
Junos_os_evolved | Juniper | 22.3-r1-s1 (including) | 22.3-r1-s1 (including) |
Junos_os_evolved | Juniper | 22.3-r1-s2 (including) | 22.3-r1-s2 (including) |
Junos_os_evolved | Juniper | 22.3-r2 (including) | 22.3-r2 (including) |
Junos_os_evolved | Juniper | 22.3-r2-s1 (including) | 22.3-r2-s1 (including) |
Junos_os_evolved | Juniper | 22.3-r2-s2 (including) | 22.3-r2-s2 (including) |
Junos_os_evolved | Juniper | 22.3-r3 (including) | 22.3-r3 (including) |
Junos_os_evolved | Juniper | 22.3-r3-s1 (including) | 22.3-r3-s1 (including) |
Junos_os_evolved | Juniper | 22.3-r3-s2 (including) | 22.3-r3-s2 (including) |
Junos_os_evolved | Juniper | 22.4 (including) | 22.4 (including) |
Junos_os_evolved | Juniper | 22.4-r1 (including) | 22.4-r1 (including) |
Junos_os_evolved | Juniper | 22.4-r1-s1 (including) | 22.4-r1-s1 (including) |
Junos_os_evolved | Juniper | 22.4-r1-s2 (including) | 22.4-r1-s2 (including) |
Junos_os_evolved | Juniper | 22.4-r2 (including) | 22.4-r2 (including) |
Junos_os_evolved | Juniper | 22.4-r2-s1 (including) | 22.4-r2-s1 (including) |
Junos_os_evolved | Juniper | 22.4-r2-s2 (including) | 22.4-r2-s2 (including) |
Junos_os_evolved | Juniper | 22.4-r3 (including) | 22.4-r3 (including) |
Junos_os_evolved | Juniper | 22.4-r3-s1 (including) | 22.4-r3-s1 (including) |
Junos_os_evolved | Juniper | 23.2 (including) | 23.2 (including) |
Junos_os_evolved | Juniper | 23.2-r1 (including) | 23.2-r1 (including) |
Junos_os_evolved | Juniper | 23.2-r1-s1 (including) | 23.2-r1-s1 (including) |
Junos_os_evolved | Juniper | 23.2-r1-s2 (including) | 23.2-r1-s2 (including) |
Junos_os_evolved | Juniper | 23.4 (including) | 23.4 (including) |
Junos_os_evolved | Juniper | 23.4-r1 (including) | 23.4-r1 (including) |
The programmer may assume that certain events or conditions will never occur or do not need to be worried about, such as low memory conditions, lack of access to resources due to restrictive permissions, or misbehaving clients or components. However, attackers may intentionally trigger these unusual conditions, thus violating the programmer’s assumptions, possibly introducing instability, incorrect behavior, or a vulnerability. Note that this entry is not exclusively about the use of exceptions and exception handling, which are mechanisms for both checking and handling unusual or unexpected conditions.