CVE-2021-32265Public exploitNetwork attack vector

Code execution via out-of-bounds memory copy

Published Sep 20, 2021 · Updated Aug 3, 2024

Buffer overflow in Bento4 through 1.6.0-637 allows remote attackers to execute code or disclose memory through a crafted MP4 file. AP4_MemoryByteStream::WritePartial passes an oversized copy length to memcpy, which reads beyond the one-byte global EmptyString buffer while mp4info clones crafted sample metadata. Processing the crafted file is required; the out-of-bounds read discloses adjacent memory or enables code execution.

CVSS severity8.8
High
EPSS probability1.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Bento4 through 1.6.0-637 allows remote attackers to execute code or disclose memory through a crafted MP4 file. AP4_MemoryByteStream::WritePartial passes an oversized copy length to memcpy, which reads beyond the one-byte global EmptyString buffer while mp4info clones crafted sample metadata. Processing the crafted file is required; the out-of-bounds read discloses adjacent memory or enables code execution.

The record

CVE
CVE-2021-32265
Published
Sep 20, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

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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