CVE-2021-32742

Name: CVE-2021-32742
Creator: NVD / NIST
Published: 2021-07-09T14:15:07.987+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.20%

Last modified Jun 17, 2026

CVE-2021-32742 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Vapor is a web framework for Swift. In versions 4.47.1 and prior, bug in the `Data.init(base32Encoded:)` function opens up the potential for exposing server memory and/or crashing the server (Denial of Service) for applications where untrusted data can end up in said function. EPSS estimates a 1.20% chance of exploitation in the next 30 days.

Description

Vapor is a web framework for Swift. In versions 4.47.1 and prior, bug in the `Data.init(base32Encoded:)` function opens up the potential for exposing server memory and/or crashing the server (Denial of Service) for applications where untrusted data can end up in said function. Vapor does not currently use this function itself so this only impact applications that use the impacted function directly or through other dependencies. The vulnerability is patched in version 4.47.2. As a workaround, one may use an alternative to Vapor's built-in `Data.init(base32Encoded:)`.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

1.20%

64.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Vapor Project	Vapor	< 4.47.2

References

https://github.com/vapor/vapor/releases/tag/4.47.2Release Notes, Third Party Advisory
https://github.com/vapor/vapor/security/advisories/GHSA-pqwh-c2f3-vxmqThird Party Advisory
https://github.com/vapor/vapor/releases/tag/4.47.2Release Notes, Third Party Advisory
https://github.com/vapor/vapor/security/advisories/GHSA-pqwh-c2f3-vxmqThird Party Advisory

Timeline

Published: Jul 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32742?

How severe is CVE-2021-32742?

CVE-2021-32742 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.20% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32742?

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-2021-32742?

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

Scan your code now

Source: NVD / NIST