Security readout for executives and security teams
Plain-English summary
Certain Go DNS lookup functions could accept malformed DNS replies. If an application trusted and displayed those returned values, unsafe content such as script-like data could reach users or downstream systems.
Executive priority
Treat this as a targeted remediation item, not an emergency, unless critical applications expose DNS lookup results to users or depend on untrusted DNS infrastructure.
Technical view
Go before 1.15.13 and 1.16.x before 1.16.5 did not fully validate DNS replies against RFC1035 formatting. The CVE notes returned DNS lookup values could contain unsafe injection content, including possible XSS, depending on application handling.
Likely exposure
Exposure is likely in applications built or running with affected Go versions that perform DNS lookups and use returned values in user-visible or security-sensitive contexts.
Exploitation context
The provided sources do not report active exploitation, and KEV is false. Practical impact depends on whether an attacker can influence DNS replies and whether the application reflects or trusts lookup results.
Researcher notes
The CVE description is concise and lacks CVSS, CWE, and exploit detail. Validate exposure through Go version provenance and application data flow, especially where DNS names are rendered in HTML or logs.
Mitigation direction
- Upgrade Go to 1.15.13, 1.16.5, or a later maintained release.
- Rebuild and redeploy applications compiled with affected Go versions.
- Check vendor advisories for downstream product-specific fixes.
- Avoid trusting DNS lookup output without context-appropriate validation or encoding.
Validation and detection
- Inventory Go toolchain and runtime versions across build and deployment environments.
- Identify applications using Go DNS lookup functions in user-visible data paths.
- Confirm rebuilt binaries use a fixed Go version.
- Review vendor advisories for affected third-party appliances or packages.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-33195 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://groups.google.com/g/golang-announceCVE reference · x_refsource_MISC
- https://groups.google.com/g/golang-announce/c/RgCMkAEQjSICVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210902-0005/CVE reference · x_refsource_CONFIRM
- GLSA-202208-02CVE reference · vendor-advisory, x_refsource_GENTOO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.