Denial of service in Juniper Junos OS and Junos OS Evolved

1) Improper Check for Unusual or Exceptional Conditions

EUVDB-ID: #VU94643

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-39517

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper error handling in the Layer 2 Address Learning Daemon (l2ald). A remote attacker on the local network can send specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.4R1-S1 - 23.4R1

Junos OS Evolved: 21.4R1-EVO - 23.4R1-S2-EVO

CPE2.3

• cpe:2.3:o:juniper_networks:juniper_junos_os:21.4R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.1R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.2R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.3R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.4R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:23.2R1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:23.4R1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:21.4R3-S6-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:22.1R3-S4-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:22.2R3-S2-EVO:*:*:*:*:*:*:*

External links

https://supportportal.juniper.net/JSA79175

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.