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Unrated severityNVD Advisory· Published Apr 22, 2021· Updated Sep 16, 2024

Junos OS: Receipt of malformed DHCPv6 packets causes jdhcpd to crash and restart.

CVE-2021-0240

Description

On Juniper Networks Junos OS platforms configured as DHCPv6 local server or DHCPv6 Relay Agent, the Juniper Networks Dynamic Host Configuration Protocol Daemon (JDHCPD) process might crash if a malformed DHCPv6 packet is received, resulting in a restart of the daemon. The daemon automatically restarts without intervention, but continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects DHCPv6. DHCPv4 is not affected by this issue. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S7; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R3-S2; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2; 20.4 versions prior to 20.4R2.

Affected products

2
  • Juniper Networks/Junosllm-fuzzy2 versions
    17.3 prior to 17.3R3-S12; 17.4 prior to 17.4R3-S5; 18.1 prior to 18.1R3-S13; 18.2 prior to 18.2R3-S8; 18.3 prior to 18.3R3-S5; 18.4 prior to 18.4R1-S8, 18.4R3-S7; 19.1 prior to 19.1R3-S5; 19.2 prior to 19.2R3-S2; 19.3 prior to 19.3R3-S2; 19.4 prior to 19.4R3-S2; 20.1 prior to 20.1R3; 20.2 prior to 20.2R2-S3, 20.2R3; 20.3 prior to 20.3R2; 20.4 prior to 20.4R2+ 1 more
    • (no CPE)range: 17.3 prior to 17.3R3-S12; 17.4 prior to 17.4R3-S5; 18.1 prior to 18.1R3-S13; 18.2 prior to 18.2R3-S8; 18.3 prior to 18.3R3-S5; 18.4 prior to 18.4R1-S8, 18.4R3-S7; 19.1 prior to 19.1R3-S5; 19.2 prior to 19.2R3-S2; 19.3 prior to 19.3R3-S2; 19.4 prior to 19.4R3-S2; 20.1 prior to 20.1R3; 20.2 prior to 20.2R2-S3, 20.2R3; 20.3 prior to 20.3R2; 20.4 prior to 20.4R2
    • (no CPE)range: 17.3

Patches

Vulnerability mechanics

References

1

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