CVE-2021-39519

Name: CVE-2021-39519
Creator: NVD / NIST
Published: 2021-09-20T16:15:11.773+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.84%

Last modified Jun 17, 2026

CVE-2021-39519 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function BlockBitmapRequester::PullQData() located in blockbitmaprequester.cpp It allows an attacker to cause Denial of Service.. EPSS estimates a 0.84% chance of exploitation in the next 30 days.

Description

An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function BlockBitmapRequester::PullQData() located in blockbitmaprequester.cpp It allows an attacker to cause Denial of Service.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.84%

53.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Jpeg	Libjpeg	<= 2020021

References

https://github.com/thorfdbg/libjpeg/issues/28Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/thorfdbg/libjpeg/issues/28Exploit, Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Sep 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39519?

How severe is CVE-2021-39519?

CVE-2021-39519 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39519?

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-2021-39519?

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

Scan your code now

Source: NVD / NIST