CVE-2021-39520
MEDIUMCVSS 6.5/10EPSS 0.84%
Last modified
CVE-2021-39520 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::PushReconstructedData() located in blockbitmaprequester.cpp. 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::PushReconstructedData() located in blockbitmaprequester.cpp. It allows an attacker to cause Denial of Service.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Jpeg | Libjpeg | <= 2020021 |
References
- https://github.com/thorfdbg/libjpeg/issues/34Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/thorfdbg/libjpeg/issues/34Exploit, Issue Tracking, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-39520?
An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function BlockBitmapRequester::PushReconstructedData() located in blockbitmaprequester.cpp. It allows an attacker to cause Denial of Service.
How severe is CVE-2021-39520?
CVE-2021-39520 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-2021-39520?
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-2021-39520?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST