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NVD / CVE Program· CNA mitre

CVE-2020-20453: FFmpeg 4.2 is affected by a Divide By Zero issue via libavcodec/aaccoder, which allows a remote malicious user to cause a Denial of Service

MediumCVSS 6.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 27/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.7% (FIRST EPSS); higher than 78.5% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: ffmpeg (Alpine:v3.13) 4.3.3-r0; ffmpeg (Alpine:v3.14) 4.4.1-r0; ffmpeg4 (Alpine:v3.16) 4.4.1-r0.

Low priority for now. Upgrade to ffmpeg (Alpine:v3.13) 4.3.3-r0; ffmpeg (Alpine:v3.14) 4.4.1-r0; ffmpeg4 (Alpine:v3.16) 4.4.1-r0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Published
May 25, 2021
Updated
Jun 16, 2026
EPSS
1.7% · 78th percentile

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.7%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
ffmpegffmpeg
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux11.0
  • debian debian linux9.0
  • ffmpeg ffmpeg4.2

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.13ffmpegbefore 4.3.3-r04.3.3-r0
Alpine:v3.14ffmpegbefore 4.4.1-r04.4.1-r0
Alpine:v3.16ffmpeg4before 4.4.1-r04.4.1-r0
Debian:10ffmpegbefore 7:4.1.8-0+deb10u17:4.1.8-0+deb10u1
Debian:11ffmpegbefore 7:4.3.3-0+deb11u17:4.3.3-0+deb11u1
Debian:12ffmpegbefore 7:4.4.1-17:4.4.1-1
Debian:9ffmpegbefore 7:3.2.16-1+deb9u17:3.2.16-1+deb9u1

Same product

ffmpeg: all records

Other highest-scoring records for the same primary product.

  • CVE-2009-4637FFmpeg 0.5 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unknown vectors that…
    45Plan
  • CVE-2016-10190Heap-based buffer overflow in libavformat/http.c in FFmpeg before 2.8.10, 3.0.x before 3.0.5, 3.1.x before 3.1.6, and 3.2.x before 3.2.2…
    42Plan
  • CVE-2009-4634Multiple integer underflows in FFmpeg 0.5 allow remote attackers to cause a denial of service and possibly execute arbitrary code via a…
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2020-20450May 25, 2021 · FFmpeg 4.2 is affected by null pointer dereference passed as argument to libavformat/aviobuf.c, which could cause a Denial of Service.
    30Monitor
  • ← EarlierCVE-2020-20451May 25, 2021 · Denial of Service issue in FFmpeg 4.2 due to resource management errors via fftools/cmdutils.c.
    30Monitor
  • Later →CVE-2020-24020May 26, 2021 · Buffer Overflow vulnerability in FFMpeg 4.2.3 in dnn_execute_layer_pad in libavfilter/dnn/dnn_backend_native_layer_pad.c due to a call to…
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:ffmpeg4.3.3-r0 · Alpine:v3.13Package registry (OSV)
alpine:ffmpeg44.4.1-r0 · Alpine:v3.16Package registry (OSV)
debian:ffmpeg7:4.4.1-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-369 · Divide By Zero

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records