CVE-2021-32742: Vapor is a web framework for Swift

Q: How do I fix CVE-2021-32742?

vapor: upgrade to 4.47.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-32742 being exploited?

CVE-2021-32742 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-32742 affect?

CVE-2021-32742 affects vapor. Severity is high (CVSS 7.5). 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 untrus

This month

HIGH 7.5UPGRADE

CVE-2021-32742 is a high-severity flaw (CVSS 7.5) affecting vapor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-502
Published	2021-07-09
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: vapor project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-09 14:15 UTCPublished CVE record published
2026-06-17 03:53 UTCUpdated Record last modified

vapor project vapor UPGRADE

Affected: < 4.47.2

Fixed in: 4.47.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy vapor || rpm -q vapor || vapor --version

2. UPGRADE to 4.47.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vapor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vapor

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-32742?

vapor: upgrade to 4.47.2. Exact commands for each OS are on this page.

Is CVE-2021-32742 being exploited?

CVE-2021-32742 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-32742 affect?

CVE-2021-32742 affects vapor. Severity is high (CVSS 7.5). 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 untrus

How urgent is CVE-2021-32742?

Priority 43/100. High severity

Software pages

Swift vulnerabilities

Related CVEs

CVE-2024-21631 MEDIUM 6.5 UPGRADE Vapor is an HTTP web framework for Swift
CVE-2023-44386 MEDIUM 5.3 UPGRADE Vapor is an HTTP web framework for Swift
CVE-2022-31019 HIGH 7.5 UPGRADE Vapor is a server-side Swift HTTP web framework
CVE-2022-31005 HIGH 7.5 UPGRADE Vapor is an HTTP web framework for Swift
CVE-2021-21328 MEDIUM 5.3 UPGRADE Vapor is a web framework for Swift

References

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