A Use After Free vulnerability in the Layer 2 Address Learning Manager (l2alm) of Juniper Networks Junos OS on QFX Series allows an adjacent malicious user to cause the Packet Forwarding Engine to crash and restart, leading to a Denial of Service (DoS). The PFE may crash when a lot of MAC learning and aging happens, but due to a Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization) that is outside the attackers direct control. This issue affects: Juniper Networks Junos OS versions before 19.4R3-S10 on QFX Series; 20.2 versions before 20.2R3-S7 on QFX Series; 20.3 versions before 20.3R3-S6 on QFX Series; 20.4 versions before 20.4R3-S5 on QFX Series; 21.1 versions before 21.1R3-S4 on QFX Series; 21.2 versions before 21.2R3-S3 on QFX Series; 21.3 versions before 21.3R3-S3 on QFX Series; 21.4 versions before 21.4R3 on QFX Series; 22.1 versions before 22.1R3 on QFX Series; 22.2 versions before 22.2R2 on QFX Series.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
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juniper junos 20.2 |
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juniper junos 20.3 |
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juniper junos 20.4 |
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juniper junos 21.1 |
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juniper junos 21.2 |
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juniper junos 21.3 |
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juniper junos 21.4 |
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juniper junos 22.1 |
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juniper junos 22.2 |
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juniper junos 22.3 |
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juniper junos 22.4 |
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