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Unrated severityNVD Advisory· Published Oct 16, 2020· Updated Sep 17, 2024

Junos OS: When a DHCPv6 Relay-Agent is configured upon receipt of a specific DHCPv6 client message, Remote Code Execution may occur.

CVE-2020-1656

Description

The DHCPv6 Relay-Agent service, part of the Juniper Enhanced jdhcpd daemon shipped with Juniper Networks Junos OS has an Improper Input Validation vulnerability which will result in a Denial of Service (DoS) condition when a DHCPv6 client sends a specific DHPCv6 message allowing an attacker to potentially perform a Remote Code Execution (RCE) attack on the target device. Continuous receipt of the specific DHCPv6 client message will result in an extended Denial of Service (DoS) condition. If adjacent devices are also configured to relay DHCP packets, and are not affected by this issue and simply transparently forward unprocessed client DHCPv6 messages, then the attack vector can be a Network-based attack, instead of an Adjacent-device attack. No other DHCP services are affected. Receipt of the packet without configuration of the DHCPv6 Relay-Agent service, will not result in exploitability of this issue. This issue affects Juniper Networks Junos OS: 12.3 versions prior to 12.3R12-S15; 12.3X48 versions prior to 12.3X48-D95; 14.1X53 versions prior to 14.1X53-D53; 15.1 versions prior to 15.1R7-S6; 15.1X49 versions prior to 15.1X49-D200; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S7; 16.2 versions prior to 16.2R2-S11; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2; 17.2 versions prior to 17.2R3-S3; 17.2X75 versions prior to 17.2X75-D44; 17.3 versions prior to 17.3R3-S7; 17.4 versions prior to 17.4R2-S9, 17.4R3; 18.1 versions prior to 18.1R3-S9; 18.2 versions prior to 18.2R2-S6, 18.2R3-S2; 18.2X75 versions prior to 18.2X75-D12, 18.2X75-D33, 18.2X75-D435, 18.2X75-D60; 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3-S1; 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3; 19.1 versions prior to 19.1R1-S4, 19.1R2; 19.2 versions prior to 19.2R1-S3, 19.2R2; 19.3 versions prior to 19.3R2.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

2
  • Juniper Networks/Junosllm-fuzzy2 versions
    12.3 prior to 12.3R12-S15; 12.3X48 prior to 12.3X48-D95; 14.1X53 prior to 14.1X53-D53; 15.1 prior to 15.1R7-S6; 15.1X49 prior to 15.1X49-D200; 15.1X53 prior to 15.1X53-D593; 16.1 prior to 16.1R7-S7; 16.2 prior to 16.2R2-S11; 17.1 prior to 17.1R2-S11,17.1R3-S2; 17.2 prior to 17.2R3-S3; 17.2X75 prior to 17.2X75-D44; 17.3 prior to 17.3R3-S7; 17.4 prior to 17.4R2-S9,17.4R3; 18.1 prior to 18.1R3-S9; 18.2 prior to 18.2R2-S6,18.2R3-S2; 18.2X75 prior to 18.2X75-D12,18.2X75-D33,18.2X75-D435,18.2X75-D60; 18.3 prior to 18.3R1-S7,18.3R2-S3,18.3R3-S1; 18.4 prior to 18.4R1-S5,18.4R2-S3,18.4R3; 19.1 prior to 19.1R1-S4,19.1R2; 19.2 prior to 19.2R1-S3,19.2R2; 19.3 prior to 19.3R2+ 1 more
    • (no CPE)range: 12.3 prior to 12.3R12-S15; 12.3X48 prior to 12.3X48-D95; 14.1X53 prior to 14.1X53-D53; 15.1 prior to 15.1R7-S6; 15.1X49 prior to 15.1X49-D200; 15.1X53 prior to 15.1X53-D593; 16.1 prior to 16.1R7-S7; 16.2 prior to 16.2R2-S11; 17.1 prior to 17.1R2-S11,17.1R3-S2; 17.2 prior to 17.2R3-S3; 17.2X75 prior to 17.2X75-D44; 17.3 prior to 17.3R3-S7; 17.4 prior to 17.4R2-S9,17.4R3; 18.1 prior to 18.1R3-S9; 18.2 prior to 18.2R2-S6,18.2R3-S2; 18.2X75 prior to 18.2X75-D12,18.2X75-D33,18.2X75-D435,18.2X75-D60; 18.3 prior to 18.3R1-S7,18.3R2-S3,18.3R3-S1; 18.4 prior to 18.4R1-S5,18.4R2-S3,18.4R3; 19.1 prior to 19.1R1-S4,19.1R2; 19.2 prior to 19.2R1-S3,19.2R2; 19.3 prior to 19.3R2
    • (no CPE)range: 12.3

Patches

Vulnerability mechanics

References

4

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