What is CVE-2021-0267?

CVE-2021-0267 is a high-severity vulnerability in Juniper Junos, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2021-04-22.

How severe is CVE-2021-0267?

High severity. CVSS v3 base score is 7.4 out of 10.

Improper input validation in Juniper Junos

CVE-2021-0267

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.005 (37.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Juniper Junos — versions 19.4, 20.1, 20.2
Juniper Networks Junos Os — versions 19.4, 20.1, 20.2

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

sirt@juniper.net (x_refsource_MISC, Vendor Advisory)
sirt@juniper.net (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-0267?: CVE-2021-0267 is a high-severity vulnerability in Juniper Junos, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2021-04-22.
How severe is CVE-2021-0267?: High severity. CVSS v3 base score is 7.4 out of 10.