CVE-2021-27429

Code execution via wrapped HeapTrack allocation size

Published Nov 20, 2023 · Updated Aug 3, 2024

Integer overflow in TI-RTOS HeapTrack in Texas Instruments SimpleLink SDKs allows local users to execute code via an extreme allocation size. HeapTrack_alloc accepts an extremely large size and returns a valid pointer to an undersized buffer after arithmetic wraps. Reachability requires locally running firmware code to pass the extreme size into the TI-RTOS allocator; the undersized allocation enables code execution on the embedded target.

CVSS severity7.4
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in TI-RTOS HeapTrack in Texas Instruments SimpleLink SDKs allows local users to execute code via an extreme allocation size. HeapTrack_alloc accepts an extremely large size and returns a valid pointer to an undersized buffer after arithmetic wraps. Reachability requires locally running firmware code to pass the extreme size into the TI-RTOS allocator; the undersized allocation enables code execution on the embedded target.

The record

CVE
CVE-2021-27429
Published
Nov 20, 2023
Updated
Aug 3, 2024
Vendor
Texas Instruments
Product
SimpleLink CC26xx SDK
Classifications
CWE-190
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 20, 2023CVE 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=0 <4.40.00

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Texas Instruments · SimpleLink CC26xx SDKversion=0 <4.40.00
Texas Instruments · SimpleLink CC32xx SDKversion=0 <4.10.03; version=0 <4.40.00.07
Texas Instruments · SimpleLink MSP432E4 SDKversion=all versions
Texas Instruments · SimpleLink CC13xx SDKversion=0 <4.40.00

Published CVSS scores

7.4CISA ICS-CERTCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

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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