CVE-2018-18508

Publication date 31 December 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In Network Security Services (NSS) before 3.36.7 and before 3.41.1, a malformed signature can cause a crash due to a null dereference, resulting in a Denial of Service.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
nss	18.10 cosmic	Fixed 2:3.36.1-1ubuntu1.2
	18.04 LTS bionic	Fixed 2:3.35-2ubuntu2.2
	16.04 LTS xenial	Fixed 2:3.28.4-0ubuntu0.16.04.5
	14.04 LTS trusty	Fixed 2:3.28.4-0ubuntu0.14.04.5

Notes

mdeslaur

not included in 3.42, error in release notes

Patch details

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

Package	Patch details
nss	Upstream: https://hg.mozilla.org/projects/nss/rev/08d1b0c1117f Upstream: https://hg.mozilla.org/projects/nss/rev/5e70b72131ac

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H