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CVE-2021-23017

Public on 2021-06-01
Modified on 2023-06-09
Description

A flaw was found in nginx. An off-by-one error while processing DNS responses allows a network attacker to write a dot character out of bounds in a heap allocated buffer which can allow overwriting the least significant byte of next heap chunk metadata likely leading to a remote code execution in certain circumstances. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Severity
Important
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CVSS v3 Base Score
8.1
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 nginx 2021-06-01 17:58 ALAS-2021-1507
Amazon Linux 2 - Nginx1 Extra nginx 2023-08-07 06:17 ALAS2NGINX1-2023-003

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD CVSSv2 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
NVD CVSSv3 7.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L