CVE-2024-30386
Junos OS and Junos OS Evolved: In a EVPN-VXLAN scenario state changes on adjacent systems can cause an l2ald process crash
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:
- All versions before 20.4R3-S8,
- 21.2 versions before 21.2R3-S6,
- 21.3 versions before 21.3R3-S5,
- 21.4 versions before 21.4R3-S4,
- 22.1 versions before 22.1R3-S3,
- 22.2 versions before 22.2R3-S1,
- 22.3 versions before 22.3R3,,
- 22.4 versions before 22.4R2;
Junos OS Evolved:
- All versions before 20.4R3-S8-EVO,
- 21.2-EVO versions before 21.2R3-S6-EVO,
- 21.3-EVO
versions before 21.3R3-S5-EVO,
- 21.4-EVO
versions before 21.4R3-S4-EVO,
- 22.1-EVO
versions before 22.1R3-S3-EVO,
- 22.2-EVO
versions before 22.2R3-S1-EVO,
- 22.3-EVO
versions before 22.3R3-EVO,
- 22.4-EVO
versions before 22.4R2-EVO.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS and Junos OS Evolved: In a EVPN-VXLAN scenario state changes on adjacent systems can cause an l2ald process crash
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:
- All versions before 20.4R3-S8,
- 21.2 versions before 21.2R3-S6,
- 21.3 versions before 21.3R3-S5,
- 21.4 versions before 21.4R3-S4,
- 22.1 versions before 22.1R3-S3,
- 22.2 versions before 22.2R3-S1,
- 22.3 versions before 22.3R3,,
- 22.4 versions before 22.4R2;
Junos OS Evolved:
- All versions before 20.4R3-S8-EVO,
- 21.2-EVO versions before 21.2R3-S6-EVO,
- 21.3-EVO
versions before 21.3R3-S5-EVO,
- 21.4-EVO
versions before 21.4R3-S4-EVO,
- 22.1-EVO
versions before 22.1R3-S3-EVO,
- 22.2-EVO
versions before 22.2R3-S1-EVO,
- 22.3-EVO
versions before 22.3R3-EVO,
- 22.4-EVO
versions before 22.4R2-EVO.
- Record
CVE-2024-30386- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-416
- Updated
- 2026-11-02
EUVDEUVD-2024-28307
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:
- All versions before 20.4R3-S8,
- 21.2 versions before 21.2R3-S6,
- 21.3 versions before 21.3R3-S5,
- 21.4 versions before 21.4R3-S4,
- 22.1 versions before 22.1R3-S3,
- 22.2 versions before 22.2R3-S1,
- 22.3 versions before 22.3R3,,
- 22.4 versions before 22.4R2;
Junos OS Evolved:
- All versions before 20.4R3-S8-EVO,
- 21.2-EVO versions before 21.2R3-S6-EVO,
- 21.3-EVO
versions before 21.3R3-S5-EVO,
- 21.4-EVO
versions before 21.4R3-S4-EVO,
- 22.1-EVO
versions before 22.1R3-S3-EVO,
- 22.2-EVO
versions before 22.2R3-S1-EVO,
- 22.3-EVO
versions before 22.3R3-EVO,
- 22.4-EVO
versions before 22.4R2-EVO.
- Record
EUVD-2024-28307- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-r4g7-rp4j-9cv7
A Use-After-Free vulnerability in the Layer 2 Address Learning Daemon (l2ald) of Juniper...
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:
- All versions before 20.4R3-S8,
- 21.2 versions before 21.2R3-S6,
- 21.3 versions before 21.3R3-S5,
- 21.4 versions before 21.4R3-S4,
- 22.1 versions before 22.1R3-S3,
- 22.2 versions before 22.2R3-S1,
- 22.3 versions before 22.3R3,,
- 22.4 versions before 22.4R2;
Junos OS Evolved:
- All versions before 20.4R3-S8-EVO,
- 21.2-EVO versions before 21.2R3-S6-EVO,
- 21.3-EVO
versions before 21.3R3-S5-EVO,
- 21.4-EVO
versions before 21.4R3-S4-EVO,
- 22.1-EVO
versions before 22.1R3-S3-EVO,
- 22.2-EVO
versions before 22.2R3-S1-EVO,
- 22.3-EVO
versions before 22.3R3-EVO,
- 22.4-EVO
versions before 22.4R2-EVO.
- Record
GHSA-r4g7-rp4j-9cv7- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-416
- Updated
- 2026-11-02
NVD
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:
- All versions before 20.4R3-S8,
- 21.2 versions before 21.2R3-S6,
- 21.3 versions before 21.3R3-S5,
- 21.4 versions before 21.4R3-S4,
- 22.1 versions before 22.1R3-S3,
- 22.2 versions before 22.2R3-S1,
- 22.3 versions before 22.3R3,,
- 22.4 versions before 22.4R2;
Junos OS Evolved:
- All versions before 20.4R3-S8-EVO,
- 21.2-EVO versions before 21.2R3-S6-EVO,
- 21.3-EVO
versions before 21.3R3-S5-EVO,
- 21.4-EVO
versions before 21.4R3-S4-EVO,
- 22.1-EVO
versions before 22.1R3-S3-EVO,
- 22.2-EVO
versions before 22.2R3-S1-EVO,
- 22.3-EVO
versions before 22.3R3-EVO,
- 22.4-EVO
versions before 22.4R2-EVO.
- Record
CVE-2024-30386- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-416
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-30386 is a high vulnerability (CVSS 7.1) in Juniper Junos, published April 12, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 19th percentile. No source names a fixed version.