Security readout for executives and security teams
Plain-English summary
This is a denial-of-service issue in Go's ZIP archive handling. A specially crafted ZIP header can make affected Go code panic when opening or reading the archive. Business risk is highest where customer-supplied ZIP files are processed by public services or automated pipelines.
Executive priority
Prioritize remediation for public upload paths, automated intake systems, and security tooling that opens ZIP files. For internal-only tools without untrusted archive input, urgency is lower but upgrades should still be scheduled.
Technical view
Go archive/zip before 1.15.13 and 1.16.x before 1.16.5 can panic in NewReader or OpenReader when an archive header contains a crafted file count. The source bundle does not provide CVSS, CWE, or evidence of code execution.
Likely exposure
Exposure is most likely in Go applications compiled with affected Go versions that process untrusted ZIP files. Debian LTS and Gentoo advisories indicate downstream package relevance, but the bundle does not enumerate affected application products.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Practical abuse would require getting an affected service, job, or tool to open a crafted ZIP archive, potentially causing a crash or failed processing task.
Researcher notes
The key observable is a panic in archive/zip NewReader or OpenReader triggered by malformed archive metadata. The bundle lacks CVSS, CWE, exploit telemetry, and detailed impact beyond panic, so treat this primarily as source-grounded denial of service.
Mitigation direction
- Upgrade Go to 1.15.13, 1.16.5, or a later supported fixed release.
- Apply relevant Debian LTS or Gentoo security updates where Go is OS-packaged.
- Identify services that accept or process ZIP files from untrusted sources.
- Check vendor guidance for affected downstream applications built with Go.
- Use operational safeguards for archive-processing services, including restart and failure monitoring.
Validation and detection
- Inventory Go toolchain versions used to build deployed services.
- Find Go services importing or using archive/zip for external ZIP input.
- Confirm deployed binaries were rebuilt with a fixed Go release.
- Review package status against Debian LTS or Gentoo advisories where applicable.
- Test archive-processing workflows for graceful handling of malformed ZIP input.
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-2021-33196 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
- https://groups.google.com/g/golang-announce/c/RgCMkAEQjSICVE reference
- [debian-lts-announce] 20220121 [SECURITY] [DLA 2891-1] golang-1.8 security updateCVE reference · mailing-list
- [debian-lts-announce] 20220121 [SECURITY] [DLA 2892-1] golang-1.7 security updateCVE reference · mailing-list
- GLSA-202208-02CVE reference · vendor-advisory
- [debian-lts-announce] 20230419 [SECURITY] [DLA 3395-1] golang-1.11 security updateCVE reference · mailing-list
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.