CVE-2018-16855

Publication date 3 December 2018

Last updated 26 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

An issue has been found in PowerDNS Recursor before version 4.1.8 where a remote attacker sending a DNS query can trigger an out-of-bounds memory read while computing the hash of the query for a packet cache lookup, possibly leading to a crash.

Status

Package Ubuntu Release Status
pdns-recursor 25.10 questing
Fixed 4.1.8-1
25.04 plucky
Fixed 4.1.8-1
24.10 oracular
Fixed 4.1.8-1
24.04 LTS noble
Fixed 4.1.8-1
23.10 mantic
Fixed 4.1.8-1
23.04 lunar
Fixed 4.1.8-1
22.10 kinetic
Fixed 4.1.8-1
22.04 LTS jammy
Fixed 4.1.8-1
21.10 impish
Fixed 4.1.8-1
21.04 hirsute
Fixed 4.1.8-1
20.10 groovy
Fixed 4.1.8-1
20.04 LTS focal
Fixed 4.1.8-1
19.10 eoan
Fixed 4.1.8-1
19.04 disco
Fixed 4.1.8-1
18.10 cosmic Ignored end of life
18.04 LTS bionic
Vulnerable
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Other references