CVE-2021-22636

Local code execution via oversized HeapMem allocation

Published Nov 20, 2023 · Updated Aug 3, 2024

Integer overflow in TI-RTOS HeapMem within Texas Instruments SimpleLink SDKs allows local users to execute code through an oversized allocation. HeapMem_allocUnprotected accepts an extremely large malloc size, wraps the allocation calculation, and returns a pointer to a buffer smaller than the caller requested. Exploitation requires firmware configured with the default HeapMem heap and a path that lets an attacker request the extreme allocation; successful use executes code in the firmware context.

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 HeapMem within Texas Instruments SimpleLink SDKs allows local users to execute code through an oversized allocation. HeapMem_allocUnprotected accepts an extremely large malloc size, wraps the allocation calculation, and returns a pointer to a buffer smaller than the caller requested. Exploitation requires firmware configured with the default HeapMem heap and a path that lets an attacker request the extreme allocation; successful use executes code in the firmware context.

The record

CVE
CVE-2021-22636
Published
Nov 20, 2023
Updated
Aug 3, 2024
Vendor
Texas Instruments
Product
SimpleLink CC26xx SDK
Classifications
CWE-190
Attack vector
local
Privileges
Unavailable

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?

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  1. Affected versionversion=0 <4.40.00

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

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

7.4ICS-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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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