CVE-2021-0687

Application hang via excessive ellipsis iteration

Published Oct 6, 2021 · Updated Aug 3, 2024

Denial of service in Android Framework 8.1 through 11 allows local users to trigger an application-not-responding state via crafted text. The Layout.java ellipsize method loops across the full ellipsized character count even when only a small requested range is copied. Exploitation requires user interaction but no additional execution privileges, and the excessive iteration hangs the affected application.

CVSS severity5.0
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

Denial of service in Android Framework 8.1 through 11 allows local users to trigger an application-not-responding state via crafted text. The Layout.java ellipsize method loops across the full ellipsized character count even when only a small requested range is copied. Exploitation requires user interaction but no additional execution privileges, and the excessive iteration hangs the affected application.

The record

CVE
CVE-2021-0687
Published
Oct 6, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-834
Attack vector
local
Privileges
authenticated

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-9 Android-10 Android-11 Android-8.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

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

Published CVSS scores

1.9NIST NVDAV:L/AC:M/Au:N/C:N/I:N/A:P
5.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-834Excessive Iteration

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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