CVE-2021-29279Public exploit

Heap corruption via unchecked negative copy length

Published Apr 19, 2021 · Updated Aug 3, 2024

Integer overflow in GPAC 1.0.1 allows context-dependent attackers to corrupt heap memory by supplying a crafted FLAC file. gf_props_assign_value uses a potentially negative value->value.data.size as the length of a memcpy operation, allowing conversion into an oversized copy. The file must be processed with GPAC; public evidence demonstrates heap corruption but does not establish code execution.

CVSS severity7.8
High
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in GPAC 1.0.1 allows context-dependent attackers to corrupt heap memory by supplying a crafted FLAC file. gf_props_assign_value uses a potentially negative value->value.data.size as the length of a memcpy operation, allowing conversion into an oversized copy. The file must be processed with GPAC; public evidence demonstrates heap corruption but does not establish code execution.

The record

CVE
CVE-2021-29279
Published
Apr 19, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, CWE-190, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 19, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-190Integer Overflow or Wraparound
T1204.002Malicious 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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