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CVE-2021-23017

Publication date 25 May 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.7 · High

Score breakdown

A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.

Status

Package Ubuntu Release Status
nginx 22.04 LTS jammy
Fixed 1.18.0-6ubuntu9
21.10 impish
Fixed 1.18.0-6ubuntu9
21.04 hirsute
Fixed 1.18.0-6ubuntu8.2
20.10 groovy
Fixed 1.18.0-6ubuntu2.2
20.04 LTS focal
Fixed 1.18.0-0ubuntu1.2
18.04 LTS bionic
Fixed 1.14.0-0ubuntu1.9
16.04 LTS xenial
14.04 LTS trusty

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Patch details

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

Package Patch details
nginx

Severity score breakdown

Parameter Value
Base score 7.7 · High
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact Low
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

References

Related Ubuntu Security Notices (USN)

Other references