CVE-2025-8556

Publication date 6 August 2025

Last updated 6 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
golang-github-cloudflare-circl	25.10 questing	Not affected
	25.04 plucky	Needs evaluation
	24.04 LTS noble	Needs evaluation
	22.04 LTS jammy	Needs evaluation

How can I get the fixes?
What do statuses mean?

Severity score breakdown

Parameter	Value
Base score	3.7 · Low
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

MITRE
NVD
Launchpad
Debian

Other references

https://www.cve.org/CVERecord?id=CVE-2025-8556
https://bugzilla.redhat.com/show_bug.cgi?id=2371624
https://github.com/cloudflare/circl/security/advisories/GHSA-2x5j-vhc8-9cwm
https://access.redhat.com/security/cve/CVE-2025-8556
https://github.com/cloudflare/circl
https://github.com/cloudflare/circl/tree/v1.6.1