CVE-2021-33195

Name: CVE-2021-33195
Creator: NVD / NIST
Published: 2021-08-02T19:15:08.407+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 3.20%

Last modified Jun 17, 2026

CVE-2021-33195 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. Go before 1.15.13 and 1.16.x before 1.16.5 has functions for DNS lookups that do not validate replies from DNS servers, and thus a return value may contain an unsafe injection (e.g., XSS) that does not conform to the RFC1035 format.. EPSS estimates a 3.20% chance of exploitation in the next 30 days.

Description

Go before 1.15.13 and 1.16.x before 1.16.5 has functions for DNS lookups that do not validate replies from DNS servers, and thus a return value may contain an unsafe injection (e.g., XSS) that does not conform to the RFC1035 format.

Metrics

CVSS 3.1

7.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS Probability

3.20%

86.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Golang	Go	< 1.15.13
Golang	Go	>= 1.16.0, < 1.16.5
Netapp	Cloud Insights Telegraf Agent	All versions

References

https://groups.google.com/g/golang-announceThird Party Advisory
https://groups.google.com/g/golang-announce/c/RgCMkAEQjSIExploit, Patch, Third Party Advisory
https://security.gentoo.org/glsa/202208-02Third Party Advisory
https://security.netapp.com/advisory/ntap-20210902-0005/Third Party Advisory
https://groups.google.com/g/golang-announceThird Party Advisory
https://groups.google.com/g/golang-announce/c/RgCMkAEQjSIExploit, Patch, Third Party Advisory
https://security.gentoo.org/glsa/202208-02Third Party Advisory
https://security.netapp.com/advisory/ntap-20210902-0005/Third Party Advisory

Timeline

Published: Aug 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33195?

How severe is CVE-2021-33195?

CVE-2021-33195 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 3.20% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33195?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-33195?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST