CVE-2021-28429

Process crash via overflowing frame-rate multiplication

Published Aug 11, 2023 · Updated Oct 9, 2024

Integer overflow in FFmpeg 4.3.2 allows local users to crash a media-processing process via a crafted MOV file. The av_timecode_make_string function multiplies the attacker-influenced frame rate by 60 and 3,600 in int arithmetic, allowing overflow to produce a zero divisor. Processing the file locally is required, and the demonstrated consequence is a process crash without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Integer overflow in FFmpeg 4.3.2 allows local users to crash a media-processing process via a crafted MOV file. The av_timecode_make_string function multiplies the attacker-influenced frame rate by 60 and 3,600 in int arithmetic, allowing overflow to produce a zero divisor. Processing the file locally is required, and the demonstrated consequence is a process crash without reported data disclosure or modification.

The record

CVE
CVE-2021-28429
Published
Aug 11, 2023
Updated
Oct 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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