Is CVE-2025-8556 in the CISA KEV catalog?

No. CVE-2025-8556 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-8556?

CVE-2025-8556 has a CVSS v3 base score of 3.7 (LOW).

What is the EPSS score for CVE-2025-8556?

CVE-2025-8556 has an EPSS score of 0.45% (36th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-8556?

Upgrade golang-github-cloudflare-circl on debian 13 to 1.6.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2025-8556

LOW

3.7

CVSS v3

NVD

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.

CWE-1287Improper Validation of Specified Type of Input

How to fix

Remediation Available

golang-github-cloudflare-circlDebian

Fixed in:1.6.1-1CVE-2025-8556

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

0.45%probability of exploitation in 30 days

36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Other references7

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-25.