CVE-2021-23017

nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name

Published Jun 1, 2021 CVSS 3.1 · 7.7 High EPSS 53.5% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-2670-1 nginx security update
Debian DSA Debian DSA DSA-4921-1 nginx security update
Ubuntu USN Ubuntu USN USN-4967-1 nginx vulnerability
Ubuntu USN Ubuntu USN USN-4967-2 nginx vulnerability
History
Type Values Removed Values Added
CPEs cpe:/a:redhat:acm:2.2::el7
cpe:/a:redhat:acm:2.4::el8
Type Values Removed Values Added
CPEs cpe:/a:redhat:acm:2.2::el7
cpe:/a:redhat:acm:2.4::el8