PT-2021-12951 · Juniper Networks · Junos

Published 2021-04-22 · Updated 2021-07-23 · CVE-2021-0240

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: Juniper Networks Junos OS versions 17.3 through 17.3R3-S11 Juniper Networks Junos OS versions 17.4 through 17.4R3-S4 Juniper Networks Junos OS versions 18.1 through 18.1R3-S12 Juniper Networks Junos OS versions 18.2 through 18.2R3-S7 Juniper Networks Junos OS versions 18.3 through 18.3R3-S4 Juniper Networks Junos OS versions 18.4 through 18.4R1-S7 and 18.4R3-S6 Juniper Networks Junos OS versions 19.1 through 19.1R3-S4 Juniper Networks Junos OS versions 19.2 through 19.2R3-S1 Juniper Networks Junos OS versions 19.3 through 19.3R3-S1 Juniper Networks Junos OS versions 19.4 through 19.4R3-S1 Juniper Networks Junos OS versions 20.1 through 20.1R2 Juniper Networks Junos OS versions 20.2 through 20.2R2-S2 and 20.2R2 Juniper Networks Junos OS versions 20.3 through 20.3R1 Juniper Networks Junos OS versions 20.4 through 20.4R1

Description: 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, and DHCPv4 is not affected.

Recommendations: For Juniper Networks Junos OS versions 17.3 through 17.3R3-S11, update to version 17.3R3-S12 or later. For Juniper Networks Junos OS versions 17.4 through 17.4R3-S4, update to version 17.4R3-S5 or later. For Juniper Networks Junos OS versions 18.1 through 18.1R3-S12, update to version 18.1R3-S13 or later. For Juniper Networks Junos OS versions 18.2 through 18.2R3-S7, update to version 18.2R3-S8 or later. For Juniper Networks Junos OS versions 18.3 through 18.3R3-S4, update to version 18.3R3-S5 or later. For Juniper Networks Junos OS versions 18.4 through 18.4R1-S7 and 18.4R3-S6, update to version 18.4R1-S8, 18.4R3-S7 or later. For Juniper Networks Junos OS versions 19.1 through 19.1R3-S4, update to version 19.1R3-S5 or later. For Juniper Networks Junos OS versions 19.2 through 19.2R3-S1, update to version 19.2R3-S2 or later. For Juniper Networks Junos OS versions 19.3 through 19.3R3-S1, update to version 19.3R3-S2 or later. For Juniper Networks Junos OS versions 19.4 through 19.4R3-S1, update to version 19.4R3-S2 or later. For Juniper Networks Junos OS versions 20.1 through 20.1R2, update to version 20.1R3 or later. For Juniper Networks Junos OS versions 20.2 through 20.2R2-S2 and 20.2R2, update to version 20.2R2-S3, 20.2R3 or later. For Juniper Networks Junos OS versions 20.3 through 20.3R1, update to version 20.3R2 or later. For Juniper Networks Junos OS versions 20.4 through 20.4R1, update to version 20.4R2 or later.

Fix

DoS

Improper Handling of Exceptional Conditions

Weakness Enumeration

CWE-703

CWE-755

Related Identifiers

CVE-2021-0240

Affected Products

Junos

References · 4

• https://kb.juniper.net/JSA11168 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-0240 · Security Note
• https://osv.dev/vulnerability/CVE-2021-0240 · Vendor Advisory
• https://t.me/cvenotify/13832 · Telegram Post