CVE-2021-44956: Two Heap based buffer overflow vulnerabilities exist in ffjpeg through 01.01.2021

Q: How do I fix CVE-2021-44956?

ffjpeg: upgrade to newer than 2021-01-01. Exact commands for each OS are on this page.

Q: Is CVE-2021-44956 being exploited?

CVE-2021-44956 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-44956 affect?

CVE-2021-44956 affects ffjpeg. Severity is medium (CVSS 6.5). 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 craft

Q: How urgent is CVE-2021-44956?

Priority 42/100. Public exploit reference

This month

MEDIUM 6.5UPGRADE

CVE-2021-44956 is a medium-severity flaw (CVSS 6.5) affecting ffjpeg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-787
Published	2022-02-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rockcarry

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-02-08 15:15 UTCPublished CVE record published
2026-06-17 04:12 UTCUpdated Record last modified

rockcarry ffjpeg UPGRADE

Affected: <= 2021-01-01

Fixed in: newer than 2021-01-01

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ffjpeg || rpm -q ffjpeg || ffjpeg --version

2. UPGRADE to newer than 2021-01-01 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ffjpeg

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ffjpeg

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-44956?

ffjpeg: upgrade to newer than 2021-01-01. Exact commands for each OS are on this page.

Is CVE-2021-44956 being exploited?

CVE-2021-44956 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-44956 affect?

CVE-2021-44956 affects ffjpeg. Severity is medium (CVSS 6.5). 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 craft

How urgent is CVE-2021-44956?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2022-35433 MEDIUM 6.5 UPGRADE ffjpeg commit caade60a69633d74100bd3c2528bddee0b6a1291 was discovered to contain a memory leak via /src/jfif.c
CVE-2022-28471 MEDIUM 6.5 DOWNGRADE In ffjpeg (commit hash: caade60), the function bmp_load() in bmp.c contains an integer overflow vulnerability,
CVE-2021-45385 MEDIUM 6.5 DOWNGRADE A Null Pointer Dereference vulnerability exits in ffjpeg d5cfd49 (2021-12-06) in bmp_load()
CVE-2021-44957 MEDIUM 6.5 UPGRADE Global buffer overflow vulnerability exist in ffjpeg through 01.01.2021
CVE-2021-34122 MEDIUM 5.5 UPGRADE The function bitstr_tell at bitstr.c in ffjpeg commit 4ab404e has a NULL pointer dereference.

References

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