CVE-2021-0635

Privilege escalation via unchecked FLV array size

Published Oct 6, 2021 · Updated Aug 3, 2024

Memory corruption in UNISOC Video Driver on Android 10 allows local users to gain privileges through a malformed FLV file. The driver's FLV extraction path fails to validate an array size before using it, causing memory corruption during playback. Opening a crafted file is required; exploitation can crash playback or execute attacker-controlled code with elevated rights.

CVSS severity7.8
High
EPSS probability0.31%
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 UNISOC Video Driver on Android 10 allows local users to gain privileges through a malformed FLV file. The driver's FLV extraction path fails to validate an array size before using it, causing memory corruption during playback. Opening a crafted file is required; exploitation can crash playback or execute attacker-controlled code with elevated rights.

The record

CVE
CVE-2021-0635
Published
Oct 6, 2021
Updated
Aug 3, 2024
Vendor
UNISOC
Product
UNISOC Video Driver
Classifications
CWE-119, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 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 privilegesunauthenticated

What is affected?

UNISOC · UNISOC Video Driverversion=Android SoC

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.1UNISOCCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L/E:F/RC:C
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Memory Corruption - Generic
T1203Exploitation for Client Execution

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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