CVE-2015-8805

Publication date 31 December 2015

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
nettle	17.04 zesty	Not affected
	16.10 yakkety	Not affected
	16.04 LTS xenial	Not affected
	15.10 wily	Fixed 3.1.1-4ubuntu0.1
	15.04 vivid	Ignored end of life
	14.04 LTS trusty	Fixed 2.7.1-1ubuntu0.1
	12.04 LTS precise	Not affected

Notes

mdeslaur

same patch as CVE-2015-8803

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
nettle	Upstream: c71d2c9

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-2897-1
Nettle vulnerabilities
15 February 2016