Read the docs
TI-2025-35691 Aliases CVE-2025-57808GHSA-mxh2-ccgj-8635

ESP-IDF web_server basic auth bypass using empty or incomplete Authorization header

Priority HIGH 70CWE-303Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

ESPHome is a system to control microcontrollers remotely through Home Automation systems. In version 2025.8.0 in the ESP-IDF platform, ESPHome's web_server authentication check can pass incorrectly when the client-supplied base64-encoded Authorization value is empty or is a substring of the correct value. This allows access to web_server functionality (including OTA, if enabled) without knowing any information about the correct username or password. This issue has been patched in version 2025.8.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01542 75th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed esphome (PyPI): 2025.8.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
esphomeesphome= 2025.8.0—No fix listedCNA
—esphome (PyPI)before 2025.8.12025.8.1Patch availableGHSA-mxh2-ccgj-8635
  • esphome Vendoresphome Affected = 2025.8.0 Fixed in — No fix listed CNA
  • esphome (PyPI) Vendor— Affected before 2025.8.1 Fixed in 2025.8.1 Patch available GHSA-mxh2-ccgj-8635

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:esphome:esphome_firmware:2025.8.0:*:*:*:*:*:*:*2025.8.0Vulnerableesphome
  • cpe:2.3:o:esphome:esphome_firmware:2025.8.0:*:*:*:*:*:*:* Versions 2025.8.0 Vulnerable ·esphome

Remediation

  • Fix · GHSA-mxh2-ccgj-8635 esphome (PyPI) Fixed in 2025.8.1 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-57808
  2. 2026-10-03 Alias added: GHSA-mxh2-ccgj-8635

References

Exploit 1

Patch 1

Advisory 1

Other 1

  • TI-2021-17945 web_server allows OTA update without checking user defined basic auth username & password CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences