CVE-2023-28964: Junos OS and Junos OS Evolved: Malformed BGP flowspec update causes RPD crash

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-04-17 · updated 2026-06-17
Weakness: CWE-130

Description

An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network based, unauthenticated attacker to cause an RPD crash leading to a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. Upon receipt of a malformed BGP flowspec update, RPD will crash resulting in a Denial of Service. This issue affects Juniper Networks Junos OS: All versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R1-S1, 20.3R2; Juniper Networks Junos OS Evolved: All versions prior to 20.1R3-EVO; 20.2 versions prior to 20.2R2-EVO; 20.3 versions prior to 20.3R2-EVO;

Affected products

Juniper Junos OS: before 18.1; 18.1, 18.1-r, 18.1-r1, 18.1-r2, 18.1-r2-s1, 18.1-r2-s2 (+150) — fixed in 18.1
Juniper Networks Junos OS Evolved: before 20.1; 20.1, 20.1-r1, 20.1-r1-s1, 20.1-r2, 20.1-r2-s1, 20.1-r2-s2 (+11) — fixed in 20.1

How to fix

Upgrade to a fixed version: Juniper Junos OS 18.1; Juniper Networks Junos OS Evolved 20.1. Check the vendor advisory for mitigations.

References

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