CVE-2024-3651

25

FAUCET Score

CVE-2024-3651 is a denial-of-service vulnerability in the kjd/idna library, specifically affecting version 3.6 of the `idna.encode()` function. Crafted input strings can cause quadratic complexity, leading to significant processing delays and a denial of service. With a CVSS score of 7.5 (HIGH), this vulnerability is remotely exploitable with low attack complexity, requiring no user interaction or privileges, and its primary impact is availability. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		>= 0.2, < 3.7CPE matchmatch criteria	cpe:2.3:a:kjd:internationalized_domain_names_in_applications::::::::

CVSS Data

CVSS version used by this source: 3.0

6.2MEDIUM

CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

Exploitability Score

2.5

Impact Score

3.6

CvssVersion

3.0

Exploit Intelligence

EPSS Score

1.39%

Probability of exploitation in next 30 days

EPSS Percentile

69.4%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0139 is in the 50th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (49)

3cxpatch availablevia llm_extracted

Fixed in: 9.4.2, 9.3.4, 9.2.6, 9.1.9

3cxpatch availablevia llm_extracted

Fixed in: 5.4.2

github_advisorypatch availablevia nvd_reference

mediatekpatch availablevia llm_extracted

Fixed in: 4.5.2

mediatekpatch availablevia llm_extracted

Fixed in: 2.2.0

microsoftpatch availablevia msrc

Product: CBL Mariner 2.0 ARMFixed in: 3.7-1

microsoftpatch availablevia msrc

Product: 19681-17086Fixed in: 3.9.19-13

microsoftpatch availablevia msrc

Product: 17545-17084Fixed in: 3.12.9-1

microsoftpatch availablevia msrc

Product: cbl2 python-idna 3.7-1 on CBL Mariner 2.0Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: azl3 python-idna 3.7-1 on Azure Linux 3.0Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: cbl2 python-idna 3.3-1 on CBL Mariner 2.0Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: azl3 python-idna 3.6-1 on Azure Linux 3.0Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: azl3 python-pip 24.0-2 on Azure Linux 3.0Fixed in: 24.0-2

microsoftpatch availablevia msrc

Product: azl3 tensorflow 2.16.1-7 on Azure Linux 3.0Fixed in: 2.16.1-7

microsoftpatch availablevia msrc

Product: azl3 tensorflow 2.16.1-9 on Azure Linux 3.0Fixed in: 2.16.1-7

microsoftpatch availablevia msrc

Product: cbl2 python3 3.9.19-13 on CBL Mariner 2.0Fixed in: 3.9.19-13

microsoftpatch availablevia msrc

Product: azl3 python3 3.12.3-5 on Azure Linux 3.0Fixed in: 3.12.9-1

microsoftpatch availablevia msrc

Product: Azure Linux 3.0 x64Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: Azure Linux 3.0 ARMFixed in: 3.7-1

microsoftpatch availablevia msrc

Product: Azure Linux 3.0 x64Fixed in: 24.0-2

microsoftpatch availablevia msrc

Product: Azure Linux 3.0 ARMFixed in: 24.0-2

microsoftpatch availablevia msrc

Product: Azure Linux 3.0 x64Fixed in: 2.16.1-7

microsoftpatch availablevia msrc

Product: Azure Linux 3.0 ARMFixed in: 2.16.1-7

microsoftpatch availablevia msrc

Product: CBL Mariner 2.0 x64Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: 17281-16823Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: 17694-17084Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: 19870-17086Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: 19875-17084Fixed in: 3.7-1

microsoftpatch availablevia msrc

Product: 17693-17084Fixed in: 24.0-2

microsoftpatch availablevia msrc

Product: 17541-17084Fixed in: 2.16.1-7

microsoftpatch availablevia msrc

Product: 17667-17084Fixed in: 2.16.1-7

pippatch availablevia ghsa

Product: idnaFixed in: 3.7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: python-idna-0:2.5-7.el8_10

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: python-idna-0:2.5-5.el8_6.1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: python-idna-0:2.5-5.el8_6.1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: python-idna-0:2.5-5.el8_6.1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.8 Extended Update SupportFixed in: python-idna-0:2.5-5.el8_8.1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: python-idna-0:2.10-7.el9_4.1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: python39-devel:3.9-8100020240516111311.d47b87a4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: python39:3.9-8100020240516111311.d47b87a4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7 Extended Lifecycle SupportFixed in: python-idna-0:2.4-2.el7_9

redhatpatch availablevia redhat_api

Product: Red Hat Ansible Automation Platform 2.4 for RHEL 9Fixed in: python-idna-0:3.7-1.el9ap

redhatpatch availablevia redhat_api

Product: Red Hat Ansible Automation Platform 2.4 for RHEL 8Fixed in: python3x-idna-0:3.7-1.el8ap

redhatno patchvia redhat_api

Product: Red Hat Satellite 6Fixed in: ansiblerole-foreman_scap_client

redhatno patchvia redhat_api

Product: Red Hat Satellite 6Fixed in: python-idna

redhatno patchvia redhat_api

Product: Red Hat Satellite 6Fixed in: python-idna-ssl

redhatend of lifevia redhat_api

Product: Red Hat Update Infrastructure 4 for Cloud ProvidersFixed in: python-idna-ssl

redhatend of lifevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: python27:2.7/python-idna

redhatend of lifevia redhat_api

Product: Red Hat Update Infrastructure 4 for Cloud ProvidersFixed in: python-idna

Vendor Advisories (8)

3cxllm-3cx-c3a15eadabccae7dCRITICAL

Third-Party Package Updates in Splunk Enterprise - June 2025

3cxllm-3cx-1205af7554fe3711HIGH

Third-Party Package Updates in Splunk User Behavior Analytics (UBA) - April 2025

mediatekllm-mediatek-07f14aebcf69020aHIGH

Third-Party Package Updates in the Splunk Add-on for Cisco Meraki - October 2024

mediatekllm-mediatek-83fe03d377f8e38eHIGH

Third-Party Package Updates in Splunk Add-on for Microsoft Office 365 - October 2024

microsoft2024-Oct/CVE-2024-3651

CVE-2024-3651

microsoft2024-Jul/CVE-2024-3651Important

Denial of Service via Quadratic Complexity in kjd/idna

redhatCVE-2024-3651Moderate

python-idna: potential DoS via resource consumption via specially crafted inputs to idna.encode()

pipGHSA-jjg7-2v4v-x38hmedium

Internationalized Domain Names in Applications (IDNA) vulnerable to denial of service from specially crafted inputs to idna.encode

References

lists.debian.org / debian-lts-announce/2024/05/msg00006.html

lists.fedoraproject.org / archives/list/[email protected]/message/4YQUPYH3SVZ5GFF2CDQ55FCM575AZTF2

lists.fedoraproject.org / archives/list/[email protected]/message/F2S5E23N6E52S46KGNYTDFB75LOC4N4D

lists.fedoraproject.org / archives/list/[email protected]/message/S5IDLLD2IKSIVRBSLB34WTSYGLMWUFWF

lists.fedoraproject.org / archives/list/[email protected]/message/ULSC7HBJKXB3BZV367WM5BR6DFEC4Z43

github.com / kjd/idna/commit/1d365e17e10d72d0b7876316fc7b9ca0eebdd38d

Patch

huntr.com / bounties/93d78d07-d791-4b39-a845-cbfabc44aadb

ExploitPatch