CVE-2021-0623

Local information disclosure via ASF integer overflow

Published Nov 18, 2021 · Updated Aug 3, 2024

Out-of-bounds read in the MediaTek ASF extractor on Android 10.0 and 11.0 allows local users to disclose memory contents. The extractor performs an out-of-bounds memory read after an integer overflow; MediaTek has not disclosed the affected function or calculation. Exploitation requires local access but no additional execution privileges or user interaction, and the bounded consequence is memory disclosure rather than modification or service interruption.

CVSS severity5.5
Medium
EPSS probability0.11%
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 read in the MediaTek ASF extractor on Android 10.0 and 11.0 allows local users to disclose memory contents. The extractor performs an out-of-bounds memory read after an integer overflow; MediaTek has not disclosed the affected function or calculation. Exploitation requires local access but no additional execution privileges or user interaction, and the bounded consequence is memory disclosure rather than modification or service interruption.

The record

CVE
CVE-2021-0623
Published
Nov 18, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, CWE-190
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 18, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.1NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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-125Out-of-bounds Read
CWE-190Integer Overflow or Wraparound

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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