CVE-2021-0689

Local information disclosure via PNG palette misclassification

Published Oct 6, 2021 · Updated Aug 3, 2024

Out-of-bounds read in Android 8.1 through 11 allows local users to disclose process memory through a specially formed PNG image. SkPngCodec honors an RGB 5-6-5 sBIT declaration for palette PNGs, causing RGB_to_BGR1_portable to read palette data using the wrong layout and beyond its bounds. A malicious local application can trigger the decoder without user interaction or additional execution privileges, exposing data outside the intended image buffer.

CVSS severity5.5
Medium
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 read in Android 8.1 through 11 allows local users to disclose process memory through a specially formed PNG image. SkPngCodec honors an RGB 5-6-5 sBIT declaration for palette PNGs, causing RGB_to_BGR1_portable to read palette data using the wrong layout and beyond its bounds. A malicious local application can trigger the decoder without user interaction or additional execution privileges, exposing data outside the intended image buffer.

The record

CVE
CVE-2021-0689
Published
Oct 6, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-125
Attack vector
local
Privileges
Unavailable

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-10 Android-11 Android-8.1 Android-9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Google Cloud · Androidversion=Android-10 Android-11 Android-8.1 Android-9

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NIST NVDCVSS: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.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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