CVE-2025-61727
Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509
Description
An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.
INFO
Published Date :
Dec. 3, 2025, 8:16 p.m.
Last Modified :
Dec. 3, 2025, 10:15 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-61727
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update certificate policies to restrict wildcard SANs.
- Implement stricter validation for SANs against excluded subdomains.
- Reissue affected certificates with correct constraints.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-61727.
| URL | Resource |
|---|---|
| https://go.dev/cl/723900 | |
| https://go.dev/issue/76442 | |
| https://groups.google.com/g/golang-announce/c/8FJoBkPddm4 | |
| https://pkg.go.dev/vuln/GO-2025-4175 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-61727 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-61727
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-61727 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-61727 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Dec. 03, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N -
New CVE Received by [email protected]
Dec. 03, 2025
Action Type Old Value New Value Added Description An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com. Added Reference https://go.dev/cl/723900 Added Reference https://go.dev/issue/76442 Added Reference https://groups.google.com/g/golang-announce/c/8FJoBkPddm4 Added Reference https://pkg.go.dev/vuln/GO-2025-4175