CVE-2023-28981

Junos OS and Junos OS Evolved: If malformed IPv6 router advertisements are received, memory corruption will occur which causes an rpd crash

Published Apr 17, 2023 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
An Improper Input Validation vulnerability in the kernel of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). If the receipt of router advertisements is enabled on an interface and a specifically malformed RA packet is received, memory corruption will happen which leads to an rpd crash. This issue affects: Juniper Networks Junos OS 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S3; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3; 21.3 versions prior to 21.3R3; 21.4 versions prior to 21.4R2; 22.1 versions prior to 22.1R2. Juniper Networks Junos OS Evolved 20.3-EVO version 20.3R1-EVO and later versions; 20.4-EVO versions prior to 20.4R3-S6-EVO; 21.3-EVO versions prior to 21.3R3-EVO; 21.4-EVO versions prior to 21.4R2-EVO; 22.1-EVO versions prior to 22.1R2-EVO.

Remediation

Vendor Solution

The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 20.4R3-S6-EVO, 21.3R3-EVO, 21.4R2-EVO, 22.1R2-EVO, 22.2R1-EVO, and all subsequent releases. Junos OS: 20.3R3-S5, 20.4R3-S3, 21.1R3-S4, 21.2R3, 21.3R3, 21.4R2, 22.1R2, 22.2R1, and all subsequent releases.


Vendor Workaround

If the receipt of router advertisements is not necessary (but just the solicited or unsolicited sending of RAs) then incoming RAs can be filtered and dropped by applying a firewall filter like the following: set firewall family inet6 filter test term 1 from next-header icmp6 set firewall family inet6 filter test term 1 from icmp-type 134 set firewall family inet6 filter test term 1 then discard set firewall family inet6 filter test term 2 then accept

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2023-32599 An Improper Input Validation vulnerability in the kernel of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). If the receipt of router advertisements is enabled on an interface and a specifically malformed RA packet is received, memory corruption will happen which leads to an rpd crash. This issue affects: Juniper Networks Junos OS 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S3; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3; 21.3 versions prior to 21.3R3; 21.4 versions prior to 21.4R2; 22.1 versions prior to 22.1R2. Juniper Networks Junos OS Evolved 20.3-EVO version 20.3R1-EVO and later versions; 20.4-EVO versions prior to 20.4R3-S6-EVO; 21.3-EVO versions prior to 21.3R3-EVO; 21.4-EVO versions prior to 21.4R2-EVO; 22.1-EVO versions prior to 22.1R2-EVO.
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
juniper
Published
Updated
Feb 5, 2025, 9:40 PM
Reserved
Mar 29, 2023, 12:00 AM
Status
Modified
Published
Apr 17, 2023, 10:15 PM
Modified
Jun 17, 2026, 5:49 AM