CVE-2025-23217Network attack vector

Unauthenticated internal API access via proxy self-tunneling

Published Feb 6, 2025 · Updated Feb 12, 2025

Authentication bypass in mitmweb before 11.1.2 allows remote attackers on the local network to access its loopback-bound internal API. The proxy listener accepts requests targeting 127.0.0.1:8081 and forwards them to API handlers that perform no request authentication. With the default block_global setting, exploitation requires local-network reachability and grants the API access available to a local client.

CVSS severity8.2
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authentication bypass in mitmweb before 11.1.2 allows remote attackers on the local network to access its loopback-bound internal API. The proxy listener accepts requests targeting 127.0.0.1:8081 and forwards them to API handlers that perform no request authentication. With the default block_global setting, exploitation requires local-network reachability and grants the API access available to a local client.

The record

CVE
CVE-2025-23217
Published
Feb 6, 2025
Updated
Feb 12, 2025
Vendor
mitmproxy
Product
mitmproxy
Classifications
CWE-288, CWE-441, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 11.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

mitmproxy · mitmproxyversion=< 11.1.2

Published CVSS scores

8.2GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
CWE-441Unintended Proxy or Intermediary ('Confused Deputy')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo