medium
5.5
CWE
1284
Advisory Published
Updated

CVE-2023-22409: Junos OS: SRX Series, MX Series with SPC3: When an inconsistent NAT configuration exists and a specific CLI command is issued the SPC will reboot

First published: Thu Jan 12 2023(Updated: )

An Unchecked Input for Loop Condition vulnerability in a NAT library of Juniper Networks Junos OS allows a local authenticated attacker with low privileges to cause a Denial of Service (DoS). When an inconsistent "deterministic NAT" configuration is present on an SRX, or MX with SPC3 and then a specific CLI command is issued the SPC will crash and restart. Repeated execution of this command will lead to a sustained DoS. Such a configuration is characterized by the total number of port blocks being greater than the total number of hosts. An example for such configuration is: [ services nat source pool TEST-POOL address x.x.x.0/32 to x.x.x.15/32 ] [ services nat source pool TEST-POOL port deterministic block-size 1008 ] [ services nat source pool TEST-POOL port deterministic host address y.y.y.0/24] [ services nat source pool TEST-POOL port deterministic include-boundary-addresses] where according to the following calculation: 65536-1024=64512 (number of usable ports per IP address, implicit) 64512/1008=64 (number of port blocks per Nat IP) x.x.x.0/32 to x.x.x.15/32 = 16 (NAT IP addresses available in NAT pool) total port blocks in NAT Pool = 64 blocks per IP * 16 IPs = 1024 Port blocks host address y.y.y.0/24 = 256 hosts (with include-boundary-addresses) If the port block size is configured to be 4032, then the total port blocks are (64512/4032) * 16 = 256 which is equivalent to the total host addresses of 256, and the issue will not be seen. This issue affects Juniper Networks Junos OS on SRX Series, and MX Series with SPC3: All versions prior to 19.4R3-S10; 20.1 version 20.1R1 and later versions; 20.2 versions prior to 20.2R3-S6; 20.3 versions prior to 20.3R3-S6; 20.4 versions prior to 20.4R3-S5; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3-S3; 21.3 versions prior to 21.3R3-S3; 21.4 versions prior to 21.4R3-S1; 22.1 versions prior to 22.1R2-S2, 22.1R3; 22.2 versions prior to 22.2R2.

Credit: sirt@juniper.net

Affected SoftwareAffected VersionHow to fix
Junos OS Evolved<19.4
Junos OS Evolved=19.4
Junos OS Evolved=19.4-r1
Junos OS Evolved=19.4-r1-s1
Junos OS Evolved=19.4-r1-s2
Junos OS Evolved=19.4-r1-s3
Junos OS Evolved=19.4-r1-s4
Junos OS Evolved=19.4-r2
Junos OS Evolved=19.4-r2-s1
Junos OS Evolved=19.4-r2-s2
Junos OS Evolved=19.4-r2-s3
Junos OS Evolved=19.4-r2-s4
Junos OS Evolved=19.4-r2-s5
Junos OS Evolved=19.4-r2-s6
Junos OS Evolved=19.4-r2-s7
Junos OS Evolved=19.4-r3
Junos OS Evolved=19.4-r3-s1
Junos OS Evolved=19.4-r3-s2
Junos OS Evolved=19.4-r3-s3
Junos OS Evolved=19.4-r3-s4
Junos OS Evolved=19.4-r3-s5
Junos OS Evolved=19.4-r3-s6
Junos OS Evolved=19.4-r3-s7
Junos OS Evolved=19.4-r3-s8
Junos OS Evolved=19.4-r3-s9
Junos OS Evolved=20.1-r1
Junos OS Evolved=20.1-r1-s1
Junos OS Evolved=20.1-r1-s2
Junos OS Evolved=20.1-r1-s3
Junos OS Evolved=20.1-r1-s4
Junos OS Evolved=20.1-r2
Junos OS Evolved=20.1-r2-s1
Junos OS Evolved=20.1-r2-s2
Junos OS Evolved=20.1-r3
Junos OS Evolved=20.1-r3-s1
Junos OS Evolved=20.1-r3-s2
Junos OS Evolved=20.1-r3-s3
Junos OS Evolved=20.1-r3-s4
Junos OS Evolved=20.2
Junos OS Evolved=20.2-r1
Junos OS Evolved=20.2-r1-s1
Junos OS Evolved=20.2-r1-s2
Junos OS Evolved=20.2-r1-s3
Junos OS Evolved=20.2-r2
Junos OS Evolved=20.2-r2-s1
Junos OS Evolved=20.2-r2-s2
Junos OS Evolved=20.2-r2-s3
Junos OS Evolved=20.2-r3
Junos OS Evolved=20.2-r3-s1
Junos OS Evolved=20.2-r3-s2
Junos OS Evolved=20.2-r3-s3
Junos OS Evolved=20.2-r3-s4
Junos OS Evolved=20.2-r3-s5
Junos OS Evolved=20.3
Junos OS Evolved=20.3-r1
Junos OS Evolved=20.3-r1-s1
Junos OS Evolved=20.3-r1-s2
Junos OS Evolved=20.3-r2
Junos OS Evolved=20.3-r2-s1
Junos OS Evolved=20.3-r3
Junos OS Evolved=20.3-r3-s1
Junos OS Evolved=20.3-r3-s2
Junos OS Evolved=20.3-r3-s3
Junos OS Evolved=20.3-r3-s4
Junos OS Evolved=20.3-r3-s5
Junos OS Evolved=20.4
Junos OS Evolved=20.4-r1
Junos OS Evolved=20.4-r1-s1
Junos OS Evolved=20.4-r2
Junos OS Evolved=20.4-r2-s1
Junos OS Evolved=20.4-r2-s2
Junos OS Evolved=20.4-r3
Junos OS Evolved=20.4-r3-s1
Junos OS Evolved=20.4-r3-s2
Junos OS Evolved=20.4-r3-s3
Junos OS Evolved=20.4-r3-s4
Junos OS Evolved=21.1
Junos OS Evolved=21.1-r1
Junos OS Evolved=21.1-r1-s1
Junos OS Evolved=21.1-r2
Junos OS Evolved=21.1-r2-s1
Junos OS Evolved=21.1-r2-s2
Junos OS Evolved=21.1-r3
Junos OS Evolved=21.1-r3-s1
Junos OS Evolved=21.1-r3-s2
Junos OS Evolved=21.1-r3-s3
Junos OS Evolved=21.2
Junos OS Evolved=21.2-r1
Junos OS Evolved=21.2-r1-s1
Junos OS Evolved=21.2-r1-s2
Junos OS Evolved=21.2-r2
Junos OS Evolved=21.2-r2-s1
Junos OS Evolved=21.2-r2-s2
Junos OS Evolved=21.2-r3
Junos OS Evolved=21.2-r3-s1
Junos OS Evolved=21.2-r3-s2
Junos OS Evolved=21.3
Junos OS Evolved=21.3-r1
Junos OS Evolved=21.3-r1-s1
Junos OS Evolved=21.3-r1-s2
Junos OS Evolved=21.3-r2
Junos OS Evolved=21.3-r2-s1
Junos OS Evolved=21.3-r2-s2
Junos OS Evolved=21.3-r3
Junos OS Evolved=21.3-r3-s1
Junos OS Evolved=21.3-r3-s2
Junos OS Evolved=21.4
Junos OS Evolved=21.4-r1
Junos OS Evolved=21.4-r1-s1
Junos OS Evolved=21.4-r1-s2
Junos OS Evolved=21.4-r2
Junos OS Evolved=21.4-r2-s1
Junos OS Evolved=21.4-r2-s2
Junos OS Evolved=21.4-r3
Junos OS Evolved=22.1-r1
Junos OS Evolved=22.1-r1-s1
Junos OS Evolved=22.1-r1-s2
Junos OS Evolved=22.1-r2
Junos OS Evolved=22.1-r2-s1
Junos OS Evolved=22.2-r1
Junos OS Evolved=22.2-r1-s1
Junos OS Evolved=22.2-r1-s2
Juniper MX10
Juniper MX10000
Juniper MX10003
Juniper MX10008
Juniper MX10016
Juniper MX104
Juniper MX150
Juniper MX2008
Juniper MX2010
Juniper MX2020
Juniper MX204
Juniper MX240
Juniper MX40
Juniper MX480
Juniper MX5
Juniper MX80
Juniper MX960
Juniper SRX100
Juniper SRX110
Juniper SRX1400
Juniper SRX1500
Juniper SRX210
Juniper SRX220
Juniper SRX240
Juniper SRX240H2
Juniper SRX240M
Juniper SRX300
Juniper SRX320
Juniper SRX340
Juniper SRX3400
Juniper SRX345
Juniper SRX3600
Juniper SRX380
Juniper SRX4000
Juniper SRX4100
Juniper SRX4200
Juniper SRX4600
Junos OS SRX 5000 Series
Juniper SRX5400
Juniper SRX550
Juniper SRX550
Juniper SRX550
Juniper SRX5600
Juniper SRX5800
Juniper SRX650

Remedy

The following software releases have been updated to resolve this specific issue: 19.4R3-S10, 20.2R3-S6, 20.3R3-S6, 20.4R3-S5, 21.1R3-S4, 21.2R3-S3, 21.3R3-S3, 21.4R3-S1, 22.1R2-S2, 22.1R3, 22.2R2, 22.3R1, 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-2023-22409?

    CVE-2023-22409 is classified as a low-severity vulnerability allowing Denial of Service (DoS) under specific conditions.

  • How do I fix CVE-2023-22409?

    To mitigate CVE-2023-22409, ensure that the NAT configuration is consistent and do not use deterministic NAT with affected Junos OS versions.

  • Which versions of Junos OS are affected by CVE-2023-22409?

    CVE-2023-22409 affects Junos OS versions up to and including 19.4 and versions starting from 20.1 up to 22.1.

  • Can CVE-2023-22409 be exploited by unauthenticated users?

    No, only authenticated users with low privileges can exploit CVE-2023-22409.

  • What types of devices are impacted by CVE-2023-22409?

    CVE-2023-22409 impacts devices running affected versions of Junos OS, including Juniper SRX and MX series.

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