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CVE-2024-21631

20
FAUCET Score

CVE-2024-21631 is an integer overflow vulnerability in Vapor's vapor_urlparser_parse function, affecting applications that use Vapor's URI type for validating user input. Specifically, the use of uint16_t indexes can lead to overflows when parsing abnormally long URLs, potentially allowing an attacker to spoof the host by manipulating the port number. This vulnerability has a CVSS score of 6.5 (Medium), indicating a network-based attack with low complexity that can lead to high integrity impact without requiring user interaction. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.90.0CPE matchmatch criteria
cpe:2.3:a:vapor:vapor:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.60%
Probability of exploitation in next 30 days
EPSS Percentile
45.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0060 is in the 55th percentile among its peer group of 21,974 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
swiftpatch availablevia ghsa
Product: github.com/vapor/vaporFixed in: 4.90.0

Vendor Advisories (1)

swiftGHSA-r6r4-5pr8-gjcpmedium

Vapor contains an integer overflow in URI leading to potential host spoofing

Jan 3, 2024

References

github.com / vapor/vapor/commit/6db3d917b5ce5024a84eb265ef65691383305d70
Patch
github.com / vapor/vapor/security/advisories/GHSA-r6r4-5pr8-gjcp
Vendor Advisory