CVE-2021-0576

Local privilege escalation via missing FLV bounds check

Published Aug 17, 2021 · Updated Aug 3, 2024

Heap overflow in MediaTek FLV Extractor on Android 8.1 through 11.0 allows local users to escalate privileges through crafted FLV data. The extractor writes beyond a heap buffer because it processes FLV data without the required bounds check. No additional execution privileges or user interaction is required, but exploitation requires local access to an affected MediaTek-based device.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in MediaTek FLV Extractor on Android 8.1 through 11.0 allows local users to escalate privileges through crafted FLV data. The extractor writes beyond a heap buffer because it processes FLV data without the required bounds check. No additional execution privileges or user interaction is required, but exploitation requires local access to an affected MediaTek-based device.

The record

CVE
CVE-2021-0576
Published
Aug 17, 2021
Updated
Aug 3, 2024
Vendor
MediaTek
Product
FLV Extractor
Classifications
CWE-122, T1404
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Android SoC

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

MediaTek · FLV Extractorversion=Android SoC

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-122Heap Overflow
T1404Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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