NULL pointer dereference in Jpeg Libjpeg

CVE-2021-39516

An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function HuffmanDecoder::Get() located in huffmandecoder.hpp. It allows an attacker to cause Denial of Service.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.4th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-39516: held from 0.009 to 0.008.

EPSS over last 30 days · oldest: 0.009 · newest: 0.008 · change: -0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-39516?
CVE-2021-39516 is a medium-severity vulnerability in Jpeg Libjpeg, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-09-20.
How severe is CVE-2021-39516?
Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2021-39516 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.