CVE-2021-38786Network attack vector

Media service crash via decoder NULL dereference

Published Jan 19, 2022 · Updated Aug 4, 2024

A NULL pointer dereference in Allwinner R818 Android Q SDK 1.0 media decoding allows remote attackers to crash the media service. The media/libcedarc/vdecoder component dereferences a NULL pointer during video decoding; public records do not identify the triggering input or function. Network access is sufficient without authentication or user interaction, and the documented consequence is limited to a media crash.

CVSS severity7.5
High
EPSS probability1.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in Allwinner R818 Android Q SDK 1.0 media decoding allows remote attackers to crash the media service. The media/libcedarc/vdecoder component dereferences a NULL pointer during video decoding; public records do not identify the triggering input or function. Network access is sufficient without authentication or user interaction, and the documented consequence is limited to a media crash.

The record

CVE
CVE-2021-38786
Published
Jan 19, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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