CVE-2020-35964Public exploitNetwork attack vector

Service interruption via undersized extradata allocation

Published Jan 3, 2021 · Updated Aug 4, 2024

Out-of-bounds write in FFmpeg 4.3.1 allows remote attackers to interrupt media processing through a crafted Vividas VIV file. The track_header function undercounts packed extradata by omitting metadata bytes and length-encoding overhead, then writes the packed data beyond the allocated buffer. Processing attacker-supplied VIV input is required, and the documented consequence is limited to a crash or service interruption rather than data disclosure or code execution.

CVSS severity6.5
Medium
EPSS probability1.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in FFmpeg 4.3.1 allows remote attackers to interrupt media processing through a crafted Vividas VIV file. The track_header function undercounts packed extradata by omitting metadata bytes and length-encoding overhead, then writes the packed data beyond the allocated buffer. Processing attacker-supplied VIV input is required, and the documented consequence is limited to a crash or service interruption rather than data disclosure or code execution.

The record

CVE
CVE-2020-35964
Published
Jan 3, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002User Execution: Malicious File

Public exploit references

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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