CVE-2024-21631: Vapor is an HTTP web framework for Swift

Q: How do I fix CVE-2024-21631?

vapor: upgrade to 4.90.0. Exact commands for each OS are on this page.

Q: Is CVE-2024-21631 being exploited?

CVE-2024-21631 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-2024-21631 affect?

CVE-2024-21631 affects vapor. Severity is medium (CVSS 6.5). Vapor is an HTTP web framework for Swift. Prior to version 4.90.0, Vapor's `vapor_urlparser_parse` function uses `uint16_t` indexes when parsing a URI's components, which may cause integer overflows when parsing untrusted inputs. This vulne

Q: How urgent is CVE-2024-21631?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2024-21631 is a medium-severity flaw (CVSS 6.5) affecting vapor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vapor is an HTTP web framework for Swift. Prior to version 4.90.0, Vapor's `vapor_urlparser_parse` function uses `uint16_t` indexes when parsing a URI's components, which may cause integer overflows when parsing untrusted inputs. This vulnerability does not affect Vapor directly but could impact applications relying on the URI type for validating user input. The URI type is used in several places in Vapor. A developer may decide to use URI to rep

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-20, CWE-190, CWE-1104
Published	2024-01-03
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2024-01-03 17:15 UTCPublished CVE record published
2026-06-17 07:09 UTCUpdated Record last modified

vapor vapor UPGRADE

Affected: < 4.90.0

Fixed in: 4.90.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.90.0 (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-2024-21631?

vapor: upgrade to 4.90.0. Exact commands for each OS are on this page.

Is CVE-2024-21631 being exploited?

CVE-2024-21631 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-2024-21631 affect?

CVE-2024-21631 affects vapor. Severity is medium (CVSS 6.5). Vapor is an HTTP web framework for Swift. Prior to version 4.90.0, Vapor's `vapor_urlparser_parse` function uses `uint16_t` indexes when parsing a URI's components, which may cause integer overflows when parsing untrusted inputs. This vulne

How urgent is CVE-2024-21631?

Priority 35/100. No elevated risk signals yet.

Software pages

Swift vulnerabilities

Related CVEs

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-2021-32742 HIGH 7.5 UPGRADE Vapor is a web framework for Swift
CVE-2021-21328 MEDIUM 5.3 UPGRADE Vapor is a web framework for Swift

References

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