medium
6.5
CWE
416
Advisory Published
Updated

CVE-2023-36833: Junos OS Evolved: PTX10001-36MR, and PTX10004, PTX10008, PTX10016 with LC1201/1202: The aftman-bt process will crash in a MoFRR scenario after multiple link flaps

First published: Fri Jul 14 2023(Updated: )

A Use After Free vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS Evolved on PTX10001-36MR, and PTX10004, PTX10008, PTX10016 with LC1201/1202 allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS). The process 'aftman-bt' will crash after multiple flaps on a multicast-only fast reroute (MoFRR) enabled interface. This will cause the respective FPC to stop forwarding traffic and it needs to be rebooted to restore the service. An indication that the system experienced this issue is the following log message:   <date> <hostname> evo-aftmand-bt[<pid>]: [Error] jexpr_fdb: sanity check failed, ... , app_name L3 Mcast Routes This issue affects Juniper Networks Junos OS Evolved on PTX10001-36MR, PTX10004, PTX10008, PTX10016 with LC1201/1202: 21.2 version 21.2R1-EVO and later versions; 21.3 version 21.3R1-EVO and later versions; 21.4 versions prior to 21.4R3-S3-EVO; 22.1 version 22.1R1-EVO and later versions; 22.2 versions prior to 22.2R3-S2-EVO; 22.3 versions prior to 22.3R3-EVO; 22.4 versions prior to 22.4R1-S2-EVO, 22.4R2-EVO.

Credit: sirt@juniper.net

Affected SoftwareAffected VersionHow to fix
Juniper Networks Junos OS=21.2
Juniper Networks Junos OS=21.2-r1
Juniper Networks Junos OS=21.2-r1-s1
Juniper Networks Junos OS=21.2-r1-s2
Juniper Networks Junos OS=21.2-r2
Juniper Networks Junos OS=21.2-r2-s1
Juniper Networks Junos OS=21.2-r2-s2
Juniper Networks Junos OS=21.2-r3
Juniper Networks Junos OS=21.2-r3-s1
Juniper Networks Junos OS=21.2-r3-s2
Juniper Networks Junos OS=21.2-r3-s3
Juniper Networks Junos OS=21.2-r3-s4
Juniper Networks Junos OS=21.2-r3-s5
Juniper Networks Junos OS=21.3
Juniper Networks Junos OS=21.3-r1
Juniper Networks Junos OS=21.3-r1-s1
Juniper Networks Junos OS=21.3-r2
Juniper Networks Junos OS=21.3-r2-s1
Juniper Networks Junos OS=21.3-r2-s2
Juniper Networks Junos OS=21.3-r3
Juniper Networks Junos OS=21.3-r3-s1
Juniper Networks Junos OS=21.3-r3-s2
Juniper Networks Junos OS=21.3-r3-s3
Juniper Networks Junos OS=21.3-r3-s4
Juniper Networks Junos OS=21.4
Juniper Networks Junos OS=21.4-r1
Juniper Networks Junos OS=21.4-r1-s1
Juniper Networks Junos OS=21.4-r1-s2
Juniper Networks Junos OS=21.4-r2
Juniper Networks Junos OS=21.4-r2-s1
Juniper Networks Junos OS=21.4-r2-s2
Juniper Networks Junos OS=21.4-r3
Juniper Networks Junos OS=21.4-r3-s1
Juniper Networks Junos OS=21.4-r3-s2
Juniper Networks Junos OS=22.1-r1
Juniper Networks Junos OS=22.1-r1-s1
Juniper Networks Junos OS=22.1-r1-s2
Juniper Networks Junos OS=22.1-r2
Juniper Networks Junos OS=22.1-r2-s1
Juniper Networks Junos OS=22.1-r3
Juniper Networks Junos OS=22.1-r3-s1
Juniper Networks Junos OS=22.1-r3-s2
Juniper Networks Junos OS=22.1-r3-s3
Juniper Networks Junos OS=22.2-r1
Juniper Networks Junos OS=22.2-r1-s1
Juniper Networks Junos OS=22.2-r2
Juniper Networks Junos OS=22.2-r2-s1
Juniper Networks Junos OS=22.2-r2-s2
Juniper Networks Junos OS=22.2-r3
Juniper Networks Junos OS=22.2-r3-s1
Juniper Networks Junos OS=22.3-r1
Juniper Networks Junos OS=22.3-r1-s1
Juniper Networks Junos OS=22.3-r1-s2
Juniper Networks Junos OS=22.3-r2
Juniper Networks Junos OS=22.3-r2-s1
Juniper Networks Junos OS=22.4-r1
Juniper Networks Junos OS=22.4-r1-s1
juniper ptx10001-36mr
juniper ptx10004
juniper ptx10008
juniper ptx10016

Remedy

The following software releases have been updated to resolve this specific issue: Junos OS Evolved 21.4R3-S3-EVO, 22.2R3-S2-EVO*, 22.3R3-EVO, 22.4R1-S2-EVO, 22.4R2-EVO, 23.1R1-EVO, and all subsequent releases.

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2023-36833?

    CVE-2023-36833 has been classified as a Denial of Service vulnerability with a high severity due to its potential impact on affected systems.

  • How do I fix CVE-2023-36833?

    To mitigate CVE-2023-36833, ensure you update your Junos OS Evolved to a version that is not affected by this vulnerability as per the vendor's guidance.

  • Which versions are affected by CVE-2023-36833?

    CVE-2023-36833 affects Junos OS Evolved versions 21.2, 21.3, 21.4, and several revisions within these versions.

  • What kind of attack can exploit CVE-2023-36833?

    CVE-2023-36833 can be exploited by an adjacent, unauthenticated attacker to cause a Denial of Service condition.

  • What products are impacted by CVE-2023-36833?

    The vulnerable products include Juniper Networks PTX10001-36MR, PTX10004, PTX10008, and PTX10016 running specific versions of Junos OS Evolved.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203