CVE-2025-8556
Github.com/cloudflare/circl: circl-fourq: missing and wrong validation can lead to incorrect results
Description
A flaw was found in CIRCL's implementation of the FourQ elliptic curve. This vulnerability allows an attacker to compromise session security via low-order point injection and incorrect point validation during Diffie-Hellman key exchange.
INFO
Published Date :
Aug. 6, 2025, 9:15 a.m.
Last Modified :
Oct. 22, 2025, 9:15 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | [email protected] |
Solution
- Update the FourQ library to the latest version.
- Implement robust input validation for Diffie-Hellman parameters.
- Validate all points rigorously in cryptographic operations.
Public PoC/Exploit Available at Github
CVE-2025-8556 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2025-8556.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-8556 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-2025-8556
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).
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-8556 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-8556 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 af854a3a-2127-422b-91ae-364da2661108
Oct. 22, 2025
Action Type Old Value New Value Added Reference https://news.ycombinator.com/item?id=45669593 Added Reference https://www.botanica.software/blog/cryptographic-issues-in-cloudflares-circl-fourq-implementation -
New CVE Received by [email protected]
Aug. 06, 2025
Action Type Old Value New Value Added Description A flaw was found in CIRCL's implementation of the FourQ elliptic curve. This vulnerability allows an attacker to compromise session security via low-order point injection and incorrect point validation during Diffie-Hellman key exchange. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Added CWE CWE-347 Added Reference https://access.redhat.com/security/cve/CVE-2025-8556 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2371624 Added Reference https://github.com/cloudflare/circl Added Reference https://github.com/cloudflare/circl/security/advisories/GHSA-2x5j-vhc8-9cwm Added Reference https://github.com/cloudflare/circl/tree/v1.6.1