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CVE-2015-8803

29
FAUCET Score

CVE-2015-8803 describes a critical vulnerability in the Nettle cryptographic library, specifically affecting the ecc_256_modp function in versions prior to 3.2. This flaw, related to improper carry propagation in the P-256 NIST elliptic curve implementation, can lead to incorrect output and impacts products from Canonical, Nettle Project, and OpenSUSE. With a CVSS score of 9.8 (CRITICAL), the vulnerability is network-exploitable with low attack complexity, potentially leading to high impact on confidentiality, integrity, and availability. Despite its high severity and EPSS score, there is no evidence of active exploitation, public exploit code, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.1.1CPE matchmatch criteria
cpe:2.3:a:nettle_project:nettle:*:*:*:*:*:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
15.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
42.1CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
13.1CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.21%
Probability of exploitation in next 30 days
EPSS Percentile
89.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0421 is in the 83rd percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: nettle-0:2.7.1-8.el7
View patch

Vendor Advisories (1)

redhatCVE-2015-8803Moderate

nettle: secp256 calculation bug

Feb 2, 2016

References

lists.fedoraproject.org / pipermail/package-announce/2016-February/176807.html
lists.fedoraproject.org / pipermail/package-announce/2016-February/177229.html
lists.fedoraproject.org / pipermail/package-announce/2016-February/177473.html
lists.opensuse.org / opensuse-updates/2016-02/msg00091.html
lists.opensuse.org / opensuse-updates/2016-02/msg00093.html
lists.opensuse.org / opensuse-updates/2016-02/msg00100.html
rhn.redhat.com / errata/RHSA-2016-2582.html
blog.fuzzing-project.org / 38-Miscomputations-of-elliptic-curve-scalar-multiplications-in-Nettle.html
git.lysator.liu.se / nettle/nettle/commit/c71d2c9d20eeebb985e3872e4550137209e3ce4d
Patch
lists.gnu.org / archive/html/info-gnu/2016-01/msg00006.html
lists.lysator.liu.se / pipermail/nettle-bugs/2015/003028.html
Vendor Advisory
openwall.com / lists/oss-security/2016/02/02/2
openwall.com / lists/oss-security/2016/02/03/1
ubuntu.com / usn/USN-2897-1