CVE-2025-23206Network attack vector

OIDC trust manipulation via disabled TLS verification

Published Jan 17, 2025 · Updated Jan 23, 2026

Improper certificate validation in AWS CDK before 2.177.0 allows man-in-the-middle attackers to influence IAM OIDC provider trust. The IAM OIDC custom resource handler calls tls.connect for CA thumbprint retrieval with rejectUnauthorized set to false, so its Lambda accepts certificates outside the trusted CA set. Exploitation requires a CDK user to supply the issuer URL and an attacker to intercept the Lambda's TLS connection; the bounded result is manipulation of the thumbprint used to establish OIDC trust.

CVSS severity1.8
Low
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in AWS CDK before 2.177.0 allows man-in-the-middle attackers to influence IAM OIDC provider trust. The IAM OIDC custom resource handler calls tls.connect for CA thumbprint retrieval with rejectUnauthorized set to false, so its Lambda accepts certificates outside the trusted CA set. Exploitation requires a CDK user to supply the issuer URL and an attacker to intercept the Lambda's TLS connection; the bounded result is manipulation of the thumbprint used to establish OIDC trust.

The record

CVE
CVE-2025-23206
Published
Jan 17, 2025
Updated
Jan 23, 2026
Vendor
Amazon Web Services
Product
AWS CDK CLI
Classifications
CWE-347, T1557
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 2.177.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Amazon Web Services · AWS CDK CLIversion=< 2.177.0

Published CVSS scores

1.8GitHub CNACVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:L/VI:L/VA:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1557Adversary-in-the-Middle

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

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Your stack

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