high
7.5
CWE
755
Advisory Published
Updated

CVE-2023-22391: Junos OS: ACX2K Series: Receipt of a high rate of specific traffic will lead to a Denial of Service (DoS)

First published: Thu Jan 12 2023(Updated: )

A vulnerability in class-of-service (CoS) queue management in Juniper Networks Junos OS on the ACX2K Series devices allows an unauthenticated network-based attacker to cause a Denial of Service (DoS). Specific packets are being incorrectly routed to a queue used for other high-priority traffic such as BGP, PIM, ICMP, ICMPV6 ND and ISAKMP. Due to this misclassification of traffic, receipt of a high rate of these specific packets will cause delays in the processing of other traffic, leading to a Denial of Service (DoS). Continued receipt of this amount of traffic will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on ACX2K Series: All versions prior to 19.4R3-S9; All 20.2 versions; 20.3 versions prior to 20.3R3-S6 on ACX2K Series; 20.4 versions prior to 20.4R3-S4 on ACX2K Series; All 21.1 versions; 21.2 versions prior to 21.2R3-S3 on ACX2K Series. Note: This issues affects legacy ACX2K Series PPC-based devices. This platform reached Last Supported Version (LSV) as of the Junos OS 21.2 Release.

Credit: sirt@juniper.net

Affected SoftwareAffected VersionHow to fix
Juniper Junos<19.4
Juniper Junos=19.4
Juniper Junos=19.4-r1
Juniper Junos=19.4-r1-s1
Juniper Junos=19.4-r1-s2
Juniper Junos=19.4-r1-s3
Juniper Junos=19.4-r1-s4
Juniper Junos=19.4-r2
Juniper Junos=19.4-r2-s1
Juniper Junos=19.4-r2-s2
Juniper Junos=19.4-r2-s3
Juniper Junos=19.4-r2-s4
Juniper Junos=19.4-r2-s5
Juniper Junos=19.4-r3-s7
Juniper Junos=19.4-r3-s8
Juniper Junos=20.2
Juniper Junos=20.2-r1
Juniper Junos=20.2-r1-s1
Juniper Junos=20.2-r1-s2
Juniper Junos=20.2-r1-s3
Juniper Junos=20.2-r2
Juniper Junos=20.2-r2-s1
Juniper Junos=20.2-r2-s2
Juniper Junos=20.2-r2-s3
Juniper Junos=20.2-r3
Juniper Junos=20.2-r3-s1
Juniper Junos=20.2-r3-s2
Juniper Junos=20.2-r3-s3
Juniper Junos=20.2-r3-s4
Juniper Junos=20.2-r3-s5
Juniper Junos=20.2-r3-s6
Juniper Junos=20.3
Juniper Junos=20.3-r1
Juniper Junos=20.3-r1-s1
Juniper Junos=20.3-r1-s2
Juniper Junos=20.3-r2
Juniper Junos=20.3-r2-s1
Juniper Junos=20.3-r3
Juniper Junos=20.3-r3-s1
Juniper Junos=20.3-r3-s2
Juniper Junos=20.3-r3-s3
Juniper Junos=20.3-r3-s4
Juniper Junos=20.3-r3-s5
Juniper Junos=20.4
Juniper Junos=20.4-r1
Juniper Junos=20.4-r1-s1
Juniper Junos=20.4-r2
Juniper Junos=20.4-r2-s1
Juniper Junos=20.4-r2-s2
Juniper Junos=20.4-r3
Juniper Junos=20.4-r3-s1
Juniper Junos=20.4-r3-s2
Juniper Junos=20.4-r3-s3
Juniper Junos=21.1
Juniper Junos=21.1-r1
Juniper Junos=21.1-r1-s1
Juniper Junos=21.1-r2
Juniper Junos=21.1-r2-s1
Juniper Junos=21.1-r2-s2
Juniper Junos=21.1-r3
Juniper Junos=21.1-r3-s1
Juniper Junos=21.1-r3-s2
Juniper Junos=21.1-r3-s4
Juniper Junos=21.2
Juniper Junos=21.2-r1
Juniper Junos=21.2-r1-s1
Juniper Junos=21.2-r1-s2
Juniper Junos=21.2-r2
Juniper Junos=21.2-r2-s1
Juniper Junos=21.2-r2-s2
Juniper Junos=21.2-r3
Juniper Junos=21.2-r3-s1
Juniper Junos=21.2-r3-s2

Remedy

The following software releases have been updated to resolve this specific issue: Junos OS 19.4R3-S9, 20.3R3-S6, 20.4R3-S4, and 21.2R3-S3. Note: Legacy ACX2000 Series PPC-based devices have reached Last Supported Version (LSV) as of Junos OS 21.2.

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2023-22391?

    CVE-2023-22391 is classified as a high severity vulnerability due to its potential to cause Denial of Service (DoS) by unauthenticated attackers.

  • How do I fix CVE-2023-22391?

    To fix CVE-2023-22391, you should upgrade to a patched version of Junos OS as recommended by Juniper Networks.

  • Which devices are affected by CVE-2023-22391?

    CVE-2023-22391 affects Juniper Networks ACX2K Series devices running specific versions of Junos OS prior to the patched updates.

  • What can an attacker do with CVE-2023-22391?

    An attacker exploiting CVE-2023-22391 can send specially crafted packets that lead to a Denial of Service condition on affected devices.

  • Is authentication required to exploit CVE-2023-22391?

    No, CVE-2023-22391 can be exploited by unauthenticated attackers from the network.

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