CVE-2021-1770Known exploitation

Arbitrary code execution via buffer overflow

Published Sep 8, 2021 · Updated Aug 3, 2024

A buffer overflow in Apple iOS and iPadOS before 14.5 allows local users to execute arbitrary code via a malicious application. Apple identifies a buffer overflow and a logic issue addressed with improved state management, but does not name the affected component or parsing operation. Exploitation requires execution of a malicious application on the device; the documented impact is arbitrary code execution, with no evidence of a remote network path.

CVSS severityUnavailable
Unscored
EPSS probability2.75%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer overflow in Apple iOS and iPadOS before 14.5 allows local users to execute arbitrary code via a malicious application. Apple identifies a buffer overflow and a logic issue addressed with improved state management, but does not name the affected component or parsing operation. Exploitation requires execution of a malicious application on the device; the documented impact is arbitrary code execution, with no evidence of a remote network path.

The record

CVE
CVE-2021-1770
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS and iPadOS
Classifications
T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 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=unspecified <14.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <14.5
Apple · tvOSversion=unspecified <14.5
Apple · macOSversion=unspecified <11.3
Apple · watchOSversion=unspecified <7.4

Published CVSS scores

No CVSS assessment is available in this record.

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
Privilegesauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

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.

Reported exploitation

Technologies

Your stack

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Your stack

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