CVE-2021-0573

Local privilege escalation via unchecked ASF bounds

Published Aug 17, 2021 · Updated Aug 3, 2024

Out-of-bounds write in Android's ASF extractor in versions 8.1 through 11.0 allows local users to escalate privileges via ASF input. On affected MediaTek chipsets, the extractor writes beyond a buffer because it fails to validate bounds while parsing that input. A low-privileged local application can trigger the flaw without user interaction and gain the extractor's elevated privileges.

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

Out-of-bounds write in Android's ASF extractor in versions 8.1 through 11.0 allows local users to escalate privileges via ASF input. On affected MediaTek chipsets, the extractor writes beyond a buffer because it fails to validate bounds while parsing that input. A low-privileged local application can trigger the flaw without user interaction and gain the extractor's elevated privileges.

The record

CVE
CVE-2021-0573
Published
Aug 17, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-787, CWE-703, 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?

Google Cloud · Androidversion=Android SoC

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/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.

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-703Improper Check or Handling of Exceptional Conditions
T1404Exploitation for Privilege Escalation

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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