A Improper Validation of Specified Index, Position, or Offset in Input 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). In a scenario where DHCP relay or local server is configured the problem can be triggered if a DHCPv4 packet with specific options is received leading to a corruption of the options read from the packet. This corruption can then lead to jdhcpd crash and restart. This issue affects: Juniper Networks Junos OS 17.4R1 and later versions prior to 18.4R3-S10.

19.1 versions prior to 19.1R3-S7.

19.2 versions prior to 19.2R1-S8, 19.2R3-S4.

19.3 versions prior to 19.3R3-S4.

19.4 versions prior to 19.4R3-S6.

20.1 versions prior to 20.1R3-S2.

20.2 versions prior to 20.2R3-S3.

20.3 versions prior to 20.3R3-S2.

20.4 versions prior to 20.4R3-S1.

21.1 versions prior to 21.1R2-S2, 21.1R3.

21.2 versions prior to 21.2R1-S2, 21.2R2, 21.2R3.

21.3 versions prior to 21.3R1-S1, 21.3R2.