CVE-2021-44956

MEDIUM

ffjpeg < 2021-01-01 - Denial of Service via jfif_decode Heap Buffer Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-44956. PoCs published by cemonatk.

AI-analyzed exploit summary This repository provides a detailed technical analysis of CVE-2021-44956, a heap-based buffer overflow vulnerability in ffjpeg's jfif_decode function. It includes AddressSanitizer outputs, reproduction steps, and references to proof-of-concept files, but does not contain functional exploit code.

Description

Two Heap based buffer overflow vulnerabilities exist in ffjpeg through 01.01.2021. It is similar to CVE-2020-23852. Issues that are in the jfif_decode function at ffjpeg/src/jfif.c (line 552) could cause a Denial of Service by using a crafted jpeg file.

Exploits (1)

github WRITEUP 3 stars
by cemonatk · poc
https://github.com/cemonatk/onefuzzyway/tree/main/CVEs/ffjpeg/CVE-2021-44956.md

This repository provides a detailed technical analysis of CVE-2021-44956, a heap-based buffer overflow vulnerability in ffjpeg's jfif_decode function. It includes AddressSanitizer outputs, reproduction steps, and references to proof-of-concept files, but does not contain functional exploit code.

Classification
Writeup 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: ffjpeg through 01.01.2021
No auth needed
Prerequisites: crafted JPEG file · ffjpeg compiled with AddressSanitizer
devstral-2 · analyzed Apr 29, 2026 Full analysis →

References (1)

Core 1
Core References
Exploit, Issue Tracking, Third Party Advisory x_refsource_misc
https://github.com/rockcarry/ffjpeg/issues/43

Scores

CVSS v3 6.5
EPSS 0.0081
EPSS Percentile 52.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Details

CWE
CWE-787
Status published
Products (1)
rockcarry/ffjpeg < 2021-01-01
Published Feb 08, 2022
Tracked Since Feb 18, 2026