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Fencer Intel
critical 9.8

CVE-2015-8805 json

The ecc_256_modq function in ecc-256.c in Nettle before 3.2 does not properly handle carry propagation and produces incorrect output in its…

published 10y ago modified 4mo ago also EUVD-2015-8674

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

The ecc_256_modq 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-2015-8803.

Patch / fix

  • nettle Debian 14, Debian 13, Debian 12 3.2-1

debian advisories DEBIAN-CVE-2015-8805

  • nettle Ubuntu 14.04 LTS 2.7.1-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2015-8805

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nettle RHEL 7 2.7.1-8.el7

red hat advisories RHSA-2016:2582

  • libnettle SLES for SAP 12 SP1, SLES for SAP 12, SLES 12 SP1 +5 more 2.7.1-9.1

suse advisories SUSE-SU-2016:0455-1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-8805 updated cvss 5.8

nettle: secp256 calculation bug

  • Red Hat Enterprise Linux Client (v. 7) nettle 2.7.1-8.el7 Red Hat Enterprise Linux Client Optional (v. 7) nettle 2.7.1-8.el7 Red Hat Enterprise Linux ComputeNode (v. 7) nettle 2.7.1-8.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) nettle 2.7.1-8.el7 Red Hat Enterprise Linux Server (v. 7) nettle 2.7.1-8.el7 Red Hat Enterprise Linux Workstation (v. 7) nettle 2.7.1-8.el7
    fixed: vendor fix RHSA-2016:2582

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.81% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.