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CVE-2020-25648

Published: 20 October 2020

A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58.

Notes

AuthorNote
leosilva
From SUSE and Rhel: This issue affects servers which are compiled against the NSS library.
Other consumers of NSS like firefox etc are not
affected by this flaw.
eslerm
CCS handling introduced after 3.28.4 with revision
c3eba3a9483abede4c35fa92b5c950a35cd9b639 and others

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
nss
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(3.61-1ubuntu2)
groovy Ignored
(end of life)
jammy Not vulnerable
(3.61-1ubuntu2)
bionic
Released (2:3.35-2ubuntu2.14)
focal
Released (2:3.49.1-1ubuntu1.7)
xenial Not vulnerable
(code not present)
impish Not vulnerable
(3.61-1ubuntu2)
kinetic Not vulnerable
(3.61-1ubuntu2)
trusty Not vulnerable
(code not present)
upstream
Released (2:3.61-1, 3.58)
Patches:
upstream: https://hg.mozilla.org/projects/nss/rev/57bbefa793232586d27cee83e74411171e128361

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H