What is CVE-2021-44956?

CVE-2021-44956 is a medium-severity vulnerability in Rockcarry Ffjpeg, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2022-02-08.

How severe is CVE-2021-44956?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2021-44956 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Rockcarry Ffjpeg

CVE-2021-44956

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.

Vulnerability class: Buffer Overflow

Published 2022-02-08 · last modified 2026-06-17.

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 (55.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

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

Affected products

Rockcarry Ffjpeg

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

github.com/rockcarry/ffjpeg/issues/43 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-44956?: CVE-2021-44956 is a medium-severity vulnerability in Rockcarry Ffjpeg, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2022-02-08.
How severe is CVE-2021-44956?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2021-44956 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.