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High severity7.4NVD Advisory· Published Apr 22, 2021· Updated Jun 17, 2026

CVE-2021-0267

CVE-2021-0267

Description

An Improper Input Validation vulnerability in the active-lease query portion in JDHCPD's DHCP Relay Agent of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) by sending a crafted DHCP packet to the device thereby crashing the jdhcpd DHCP service. This is typically configured for Broadband Subscriber Sessions. Continued receipt and processing of this crafted packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS: 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2. This issue does not affect Junos OS Evolved.

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Affected products

25
  • Juniper Networks/Junos25 versions
    cpe:2.3:o:juniper:junos:19.4:r1-s1:*:*:*:*:*:*+ 24 more
    • cpe:2.3:o:juniper:junos:19.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.3:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.3:r1:*:*:*:*:*:*
    • (no CPE)range: 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2
    • (no CPE)range: 19.4

Patches

Vulnerability mechanics

References

2

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