Security readout for executives and security teams
Plain-English summary
A Swift Vapor application can leak server memory or crash if attacker-controlled input reaches Vapor's base32 decoding helper. Vapor itself does not call this helper, so risk is limited to applications or dependencies that use it. The fixed Vapor version is 4.47.2.
Executive priority
Treat as high priority where Vapor services process external input through base32 decoding. Prioritize upgrade validation for internet-facing services and dependency paths. Lower urgency is reasonable for services that do not use the vulnerable function.
Technical view
CVE-2021-32742 affects vapor/vapor versions 4.47.1 and earlier. The vulnerable surface is Data.init(base32Encoded:) when untrusted data reaches that function. The reported impacts are possible server memory exposure and denial of service. CVSS 3.1 is 7.5 high with high complexity and required privileges.
Likely exposure
Exposure is likely only for Swift/Vapor applications on Vapor 4.47.1 or earlier that pass untrusted input into Data.init(base32Encoded:) directly or through another dependency. Applications merely using Vapor without that function may not be affected.
Exploitation context
The supplied sources do not show CISA KEV listing or other evidence of active exploitation. Exploitability depends on attacker-controlled data reaching the affected base32 decoder. The CVSS vector lists network access, low privileges, high complexity, and no user interaction.
Researcher notes
The advisory says Vapor does not currently use the function itself, making reachability the central question. CVE data lists CWE-502, but the concrete issue described is unsafe handling inside base32 decoding. No source in the bundle provides exploit details or broader affected products.
Mitigation direction
- Upgrade vapor/vapor to version 4.47.2 or later.
- If immediate upgrade is blocked, avoid Vapor's built-in Data.init(base32Encoded:).
- Use an alternative base32 decoder until vendor-fixed code is deployed.
- Review vendor advisory and release notes before production rollout.
Validation and detection
- Inventory Vapor versions in Swift package manifests and lockfiles.
- Search application and dependency code for Data.init(base32Encoded:) usage.
- Confirm whether any usage receives user-controlled or external input.
- Verify deployed artifacts include Vapor 4.47.2 or later.
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.
CWE-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-32742 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H1.65.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/vapor/vapor/security/advisories/GHSA-pqwh-c2f3-vxmqCVE reference · x_refsource_CONFIRM
- https://github.com/vapor/vapor/releases/tag/4.47.2CVE reference · x_refsource_MISC
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.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.