Is CVE-2015-8803 in the CISA KEV catalog?

No. CVE-2015-8803 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-8803?

CVE-2015-8803 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2015-8803?

CVE-2015-8803 has an EPSS score of 4.13% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-8803?

Upgrade nettle on debian 11 to 3.2-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2015-8803

CRITICALEPSS 90th pctl

9.8

CVSS v3

NVD

Description

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.

CWE-254 CWE-310Cryptographic Issues

How to fix

Remediation Available

nettleDebian

Fixed in:3.2-1CVE-2015-8803

libnettle4Ubuntu

Fixed in:2.7.1-1ubuntu0.1USN-2897-1

nettleUbuntu

Fixed in:2.7.1-1ubuntu0.1USN-2897-1

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 ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.13%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Patch1

git.lysator.liu.se

Vendor Advisory1

lists.lysator.liu.se

Other references12

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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 2026-05-06.