CVE-2021-30255

Memory corruption via unvalidated PDM DIAG index

Published Nov 12, 2021 · Updated Aug 3, 2024

Buffer overflow in Qualcomm Snapdragon FTM allows local users to corrupt memory through a crafted PDM DIAG command. The PDM DIAG handler in FTM fails to validate an input before using it as an array index, allowing an out-of-range value to overflow the intended buffer. Exploitation requires local low-privileged access and no user interaction; Qualcomm has not published the exact malformed field or resulting execution path.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Qualcomm Snapdragon FTM allows local users to corrupt memory through a crafted PDM DIAG command. The PDM DIAG handler in FTM fails to validate an input before using it as an array index, allowing an out-of-range value to overflow the intended buffer. Exploitation requires local low-privileged access and no user interaction; Qualcomm has not published the exact malformed field or resulting execution path.

The record

CVE
CVE-2021-30255
Published
Nov 12, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-129, CAPEC-100
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8Qualcomm, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
CAPEC-100Overflow Buffers

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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