A Use-After-Free vulnerability in the Layer 2 Address Learning Daemon (l2ald)
of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause l2ald to crash leading to a Denial-of-Service (DoS).
In an EVPN-VXLAN scenario, when
state updates are received and processed by the affected system, the correct order of some processing steps is not ensured, which can lead to an l2ald crash and restart. Whether the crash occurs depends on system internal timing which is outside the attackers control. This issue affects:
Junos OS:
Junos OS Evolved:
versions before 21.3R3-S5-EVO,
versions before 21.4R3-S4-EVO,
versions before 22.1R3-S3-EVO,
versions before 22.2R3-S1-EVO,
versions before 22.3R3-EVO,
versions before 22.4R2-EVO.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Junos | Juniper | * | 20.4 (excluding) |
| Junos | Juniper | 20.4 (including) | 20.4 (including) |
| Junos | Juniper | 20.4-r1 (including) | 20.4-r1 (including) |
| Junos | Juniper | 20.4-r1-s1 (including) | 20.4-r1-s1 (including) |
| Junos | Juniper | 20.4-r2 (including) | 20.4-r2 (including) |
| Junos | Juniper | 20.4-r2-s1 (including) | 20.4-r2-s1 (including) |
| Junos | Juniper | 20.4-r2-s2 (including) | 20.4-r2-s2 (including) |
| Junos | Juniper | 20.4-r3 (including) | 20.4-r3 (including) |
| Junos | Juniper | 20.4-r3-s1 (including) | 20.4-r3-s1 (including) |
| Junos | Juniper | 20.4-r3-s2 (including) | 20.4-r3-s2 (including) |
| Junos | Juniper | 20.4-r3-s3 (including) | 20.4-r3-s3 (including) |
| Junos | Juniper | 20.4-r3-s4 (including) | 20.4-r3-s4 (including) |
| Junos | Juniper | 20.4-r3-s5 (including) | 20.4-r3-s5 (including) |
| Junos | Juniper | 20.4-r3-s6 (including) | 20.4-r3-s6 (including) |
| Junos | Juniper | 20.4-r3-s7 (including) | 20.4-r3-s7 (including) |
| Junos | Juniper | 21.2 (including) | 21.2 (including) |
| Junos | Juniper | 21.2-r1 (including) | 21.2-r1 (including) |
| Junos | Juniper | 21.2-r1-s1 (including) | 21.2-r1-s1 (including) |
| Junos | Juniper | 21.2-r1-s2 (including) | 21.2-r1-s2 (including) |
| Junos | Juniper | 21.2-r2 (including) | 21.2-r2 (including) |
| Junos | Juniper | 21.2-r2-s1 (including) | 21.2-r2-s1 (including) |
| Junos | Juniper | 21.2-r2-s2 (including) | 21.2-r2-s2 (including) |
| Junos | Juniper | 21.2-r3 (including) | 21.2-r3 (including) |
| Junos | Juniper | 21.2-r3-s1 (including) | 21.2-r3-s1 (including) |
| Junos | Juniper | 21.2-r3-s2 (including) | 21.2-r3-s2 (including) |
| Junos | Juniper | 21.2-r3-s3 (including) | 21.2-r3-s3 (including) |
| Junos | Juniper | 21.2-r3-s4 (including) | 21.2-r3-s4 (including) |
| Junos | Juniper | 21.2-r3-s5 (including) | 21.2-r3-s5 (including) |
| Junos | Juniper | 21.3 (including) | 21.3 (including) |
| Junos | Juniper | 21.3-r1 (including) | 21.3-r1 (including) |
| Junos | Juniper | 21.3-r1-s1 (including) | 21.3-r1-s1 (including) |
| Junos | Juniper | 21.3-r1-s2 (including) | 21.3-r1-s2 (including) |
| Junos | Juniper | 21.3-r2 (including) | 21.3-r2 (including) |
| Junos | Juniper | 21.3-r2-s1 (including) | 21.3-r2-s1 (including) |
| Junos | Juniper | 21.3-r2-s2 (including) | 21.3-r2-s2 (including) |
| Junos | Juniper | 21.3-r3 (including) | 21.3-r3 (including) |
| Junos | Juniper | 21.3-r3-s1 (including) | 21.3-r3-s1 (including) |
| Junos | Juniper | 21.3-r3-s2 (including) | 21.3-r3-s2 (including) |
| Junos | Juniper | 21.3-r3-s3 (including) | 21.3-r3-s3 (including) |
| Junos | Juniper | 21.3-r3-s4 (including) | 21.3-r3-s4 (including) |
| 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 | 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 | 22.2 (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 | 22.3 (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 | 22.4 (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_os_evolved | Juniper | * | 20.4 (excluding) |
| Junos_os_evolved | Juniper | 20.4 (including) | 20.4 (including) |
| Junos_os_evolved | Juniper | 20.4-r1 (including) | 20.4-r1 (including) |
| Junos_os_evolved | Juniper | 20.4-r1-s1 (including) | 20.4-r1-s1 (including) |
| Junos_os_evolved | Juniper | 20.4-r1-s2 (including) | 20.4-r1-s2 (including) |
| Junos_os_evolved | Juniper | 20.4-r2 (including) | 20.4-r2 (including) |
| Junos_os_evolved | Juniper | 20.4-r2-s1 (including) | 20.4-r2-s1 (including) |
| Junos_os_evolved | Juniper | 20.4-r2-s2 (including) | 20.4-r2-s2 (including) |
| Junos_os_evolved | Juniper | 20.4-r2-s3 (including) | 20.4-r2-s3 (including) |
| Junos_os_evolved | Juniper | 20.4-r3 (including) | 20.4-r3 (including) |
| Junos_os_evolved | Juniper | 20.4-r3-s1 (including) | 20.4-r3-s1 (including) |
| Junos_os_evolved | Juniper | 20.4-r3-s2 (including) | 20.4-r3-s2 (including) |
| Junos_os_evolved | Juniper | 20.4-r3-s3 (including) | 20.4-r3-s3 (including) |
| Junos_os_evolved | Juniper | 20.4-r3-s4 (including) | 20.4-r3-s4 (including) |
| Junos_os_evolved | Juniper | 20.4-r3-s5 (including) | 20.4-r3-s5 (including) |
| Junos_os_evolved | Juniper | 20.4-r3-s6 (including) | 20.4-r3-s6 (including) |
| Junos_os_evolved | Juniper | 20.4-r3-s7 (including) | 20.4-r3-s7 (including) |
| Junos_os_evolved | Juniper | 21.2 (including) | 21.2 (including) |
| Junos_os_evolved | Juniper | 21.2-r1 (including) | 21.2-r1 (including) |
| Junos_os_evolved | Juniper | 21.2-r1-s1 (including) | 21.2-r1-s1 (including) |
| Junos_os_evolved | Juniper | 21.2-r1-s2 (including) | 21.2-r1-s2 (including) |
| Junos_os_evolved | Juniper | 21.2-r2 (including) | 21.2-r2 (including) |
| Junos_os_evolved | Juniper | 21.2-r2-s1 (including) | 21.2-r2-s1 (including) |
| Junos_os_evolved | Juniper | 21.2-r2-s2 (including) | 21.2-r2-s2 (including) |
| Junos_os_evolved | Juniper | 21.2-r3 (including) | 21.2-r3 (including) |
| Junos_os_evolved | Juniper | 21.2-r3-s1 (including) | 21.2-r3-s1 (including) |
| Junos_os_evolved | Juniper | 21.2-r3-s2 (including) | 21.2-r3-s2 (including) |
| Junos_os_evolved | Juniper | 21.2-r3-s3 (including) | 21.2-r3-s3 (including) |
| Junos_os_evolved | Juniper | 21.2-r3-s4 (including) | 21.2-r3-s4 (including) |
| Junos_os_evolved | Juniper | 21.2-r3-s5 (including) | 21.2-r3-s5 (including) |
| Junos_os_evolved | Juniper | 21.3 (including) | 21.3 (including) |
| Junos_os_evolved | Juniper | 21.3-r1 (including) | 21.3-r1 (including) |
| Junos_os_evolved | Juniper | 21.3-r1-s1 (including) | 21.3-r1-s1 (including) |
| Junos_os_evolved | Juniper | 21.3-r2 (including) | 21.3-r2 (including) |
| Junos_os_evolved | Juniper | 21.3-r2-s1 (including) | 21.3-r2-s1 (including) |
| Junos_os_evolved | Juniper | 21.3-r2-s2 (including) | 21.3-r2-s2 (including) |
| Junos_os_evolved | Juniper | 21.3-r3 (including) | 21.3-r3 (including) |
| Junos_os_evolved | Juniper | 21.3-r3-s1 (including) | 21.3-r3-s1 (including) |
| Junos_os_evolved | Juniper | 21.3-r3-s2 (including) | 21.3-r3-s2 (including) |
| Junos_os_evolved | Juniper | 21.3-r3-s3 (including) | 21.3-r3-s3 (including) |
| Junos_os_evolved | Juniper | 21.3-r3-s4 (including) | 21.3-r3-s4 (including) |
| 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 | 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 | 22.2 (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 | 22.3 (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 | 22.4 (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) |