CVE-2021-33195
golang: net: lookup functions may return invalid host names
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 18, 2021
Updated · June 28, 2026
Description
A flaw was found in Go. The LookupCNAME, LookupSRV, LookupMX, LookupNS, and LookupAddr functions in the net package and methods on the Resolver type, may return arbitrary values retrieved from DNS, allowing injection of unexpected contents. The highest threat from this vulnerability is to integrity.
Statement
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Since OpenShift Container Platform 3.11 is in Maintenance Phase of the support, only Important and Critical severity vulnerabilities will be addressed at this time.
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For Red Hat OpenStack Platform, because the flaw has a lower impact and the fix would require a substantial amount of development, no update will be provided at this time for the golang-qpid-apache package.
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In Service Telemetry Framework, because the flaw has a lower impact and the package is not directly used by STF, no updates will be provided at this time for the STF containers.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-20 · Improper Input Validation