CVE-2021-0625

Local privilege escalation via improper CCU locking

Published Oct 25, 2021 · Updated Aug 3, 2024

Memory corruption in MediaTek CCU on affected chipsets running Android 10.0 or 11.0 allows local users to elevate privileges. The CCU performs memory operations with improper locking, allowing concurrent access to corrupt memory; no finer code locus is public. Exploitation requires local access and System execution privileges, needs no user interaction, and grants higher execution privileges.

CVSS severity6.7
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in MediaTek CCU on affected chipsets running Android 10.0 or 11.0 allows local users to elevate privileges. The CCU performs memory operations with improper locking, allowing concurrent access to corrupt memory; no finer code locus is public. Exploitation requires local access and System execution privileges, needs no user interaction, and grants higher execution privileges.

The record

CVE
CVE-2021-0625
Published
Oct 25, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-667, CWE-119, T1404
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 25, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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