An Improper Input Validation vulnerability in the Juniper DHCP daemon (jdhcpd) of Juniper Networks Junos OS allows an adjacent unauthenticated attacker to cause a crash of jdhcpd and thereby a Denial of Service (DoS).

If a device is configured as DHCPv6 local server and persistent storage is enabled, jdhcpd will crash when receiving a specific DHCPv6 message.

This issue affects:

Juniper Networks Junos OS

• All versions prior to 15.1R7-S11;
• 18.4 versions prior to 18.4R3-S9;
• 19.1 versions prior to 19.1R2-S3, 19.1R3-S7;
• 19.2 versions prior to 19.2R1-S8, 19.2R3-S3;
• 19.4 versions prior to 19.4R3-S5;
• 20.1 versions prior to 20.1R3-S1;
• 20.2 versions prior to 20.2R3-S2;
• 20.3 versions prior to 20.3R3-S1;
• 20.4 versions prior to 20.4R3;
• 21.1 versions prior to 21.1R2;
• 21.2 versions prior to 21.2R2.

For a device to be affected at least one of the following two lines of configuration need to be present:

[ system services dhcp-local-server dhcpv6 persistent-storage automatic ]

or

[ forwarding-options dhcp-relay dhcpv6 persistent-storage automatic ]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned  CVE-2022-22163 .

The following software releases have been updated to resolve this specific issue: 15.1R7-S11, 18.4R3-S9, 19.1R2-S3, 19.1R3-S7, 19.2R1-S8, 19.2R3-S3, 19.4R3-S5, 20.1R3-S1, 20.2R3-S2, 20.3R3-S1, 20.4R3, 21.1R2, 21.1R3, 21.2R2, 21.3R1, and all subsequent releases.

This issue is being tracked as  1594371 .

There are no viable workarounds for this issue.