Vulnerability Details CVE-2024-39557
An Uncontrolled Resource Consumption vulnerability in the
Layer 2 Address Learning Daemon (l2ald)
of Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a memory leak, eventually exhausting all system memory, leading to a system crash and Denial of Service (DoS).
Certain MAC table updates cause a small amount of memory to leak. Once memory utilization reaches its limit, the issue will result in a system crash and restart.
To identify the issue, execute the CLI command:
user@device> show platform application-info allocations app l2ald-agent
EVL Object Allocation Statistics:
Node Application Context Name Live Allocs Fails Guids
re0 l2ald-agent net::juniper::rtnh::L2Rtinfo 1069096 1069302 0 1069302
re0 l2ald-agent net::juniper::rtnh::NHOpaqueTlv 114 195 0 195
This issue affects Junos OS Evolved:
* All versions before 21.4R3-S8-EVO,
* from 22.2-EVO before 22.2R3-S4-EVO,
* from 22.3-EVO before 22.3R3-S3-EVO,
* from 22.4-EVO before 22.4R3-EVO,
* from 23.2-EVO before 23.2R2-EVO.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 22.3%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2024-39557
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cpe:2.3:o:juniper:junos_os_evolved:18.3
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cpe:2.3:o:juniper:junos_os_evolved:19.1
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cpe:2.3:o:juniper:junos_os_evolved:19.2
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cpe:2.3:o:juniper:junos_os_evolved:19.3
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cpe:2.3:o:juniper:junos_os_evolved:19.4
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cpe:2.3:o:juniper:junos_os_evolved:20.1
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cpe:2.3:o:juniper:junos_os_evolved:20.2
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cpe:2.3:o:juniper:junos_os_evolved:20.3
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cpe:2.3:o:juniper:junos_os_evolved:20.4
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cpe:2.3:o:juniper:junos_os_evolved:21.1
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cpe:2.3:o:juniper:junos_os_evolved:21.2
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cpe:2.3:o:juniper:junos_os_evolved:21.3
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cpe:2.3:o:juniper:junos_os_evolved:21.4
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cpe:2.3:o:juniper:junos_os_evolved:22.2
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cpe:2.3:o:juniper:junos_os_evolved:22.3
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cpe:2.3:o:juniper:junos_os_evolved:22.4
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cpe:2.3:o:juniper:junos_os_evolved:23.2