CVE-2015-8803

CRITICAL

The ecc_256_modp function in ecc-256.c in Nettle before 3.2 does not properly handle carry propagation and produces incorrect output in its implementation of the P-256 NIST elliptic curve, which allows attackers to have unspecified impact via unknown vectors, a different vulnerability than CVE-2015-8805.

Published: Feb 23, 2016 Modified: May 6, 2026

CWE-254 CWE-310

CVSS Metrics

CVSSv3

Attack Vector: NETWORK Attack Complexity: LOW Privileges Required: NONE User Interaction: NONE Scope: UNCHANGED Confidentiality Impact: HIGH Integrity Impact: HIGH Availability Impact: HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Products (6)

Vendor	Product	Version
nettle_project	nettle	*
canonical	ubuntu_linux	14.04
canonical	ubuntu_linux	15.10
opensuse	leap	42.1
opensuse	opensuse	13.1
opensuse	opensuse	13.2

GitHub Security Advisory GHSA-9224-822v-4vv3

The ecc_256_modp function in ecc-256.c in Nettle before 3.2 does not properly handle carry...

References (28)

Risk Scores

CVSS Score 9.8 / 10

EPSS Score 12.34%

Top 6% most likely to be exploited

Threat Score 42.9 / 100

Data Sources

NVD EPSS GitHub