HIGH
CVE-2021-33195
CWE-74Published: August 2, 2021· Updated: Jun 17, 2026
7.3
CVSS v3.1
Official 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.
Technical Analysis
CVE-2021-33195 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (8)
→
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
Quick Facts
CVE IDCVE-2021-33195
CVSS Score7.3 / 10
SeverityHIGH
WeaknessCWE-74
CISA KEVNo
Affected2 vendor(s)
PublishedAug 2, 2021
Related CVEs (CWE-74)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-33195 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.