CVE-2021-4249

Name: CVE-2021-4249
Creator: NVD / NIST
Published: 2022-12-18T15:15:10.063+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.80%

Last modified Jun 17, 2026

CVE-2021-4249 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability was found in xml-conduit. It has been classified as problematic. EPSS estimates a 0.80% chance of exploitation in the next 30 days.

Description

A vulnerability was found in xml-conduit. It has been classified as problematic. Affected is an unknown function of the file xml-conduit/src/Text/XML/Stream/Parse.hs of the component DOCTYPE Entity Expansion Handler. The manipulation leads to infinite loop. It is possible to launch the attack remotely. Upgrading to version 1.9.1.0 is able to address this issue. The name of the patch is 4be1021791dcdee8b164d239433a2043dc0939ea. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216204.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.80%

51.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-404

Affected Software

Vendor	Product	Versions
Haskell	Xml-Conduit	< 1.9.1.0

References

https://github.com/snoyberg/xml/commit/4be1021791dcdee8b164d239433a2043dc0939eaPatch, Third Party Advisory
https://github.com/snoyberg/xml/pull/161Patch, Third Party Advisory
https://hackage.haskell.org/package/xml-conduit-1.9.1.0Release Notes, Vendor Advisory
https://vuldb.com/?id.216204Third Party Advisory
https://github.com/snoyberg/xml/commit/4be1021791dcdee8b164d239433a2043dc0939eaPatch, Third Party Advisory
https://github.com/snoyberg/xml/pull/161Patch, Third Party Advisory
https://hackage.haskell.org/package/xml-conduit-1.9.1.0Release Notes, Vendor Advisory
https://vuldb.com/?id.216204Third Party Advisory

Timeline

Published: Dec 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4249?

How severe is CVE-2021-4249?

CVE-2021-4249 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4249?

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-2021-4249?

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

Scan your code now

Source: NVD / NIST