CVE-2021-22673Network attack vector

Remote code execution via OTA stack overflow

Published May 7, 2021 · Updated Aug 3, 2024

Stack-based buffer overflow in Texas Instruments SimpleLink SDKs allows remote authenticated users to execute code during OTA updates. During processing of firmware delivered by the CDN, the OTA update path writes more data to a stack buffer than the buffer can hold. Exploitation requires authenticated network access and a crafted update that the device processes; memory corruption can execute code or crash the device.

CVSS severity7.2
High
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Texas Instruments SimpleLink SDKs allows remote authenticated users to execute code during OTA updates. During processing of firmware delivered by the CDN, the OTA update path writes more data to a stack buffer than the buffer can hold. Exploitation requires authenticated network access and a crafted update that the device processes; memory corruption can execute code or crash the device.

The record

CVE
CVE-2021-22673
Published
May 7, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, CWE-787
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 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 vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.0NVDAV:N/AC:M/Au:S/C:P/I:P/A:P
8.0NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
7.2CISACVSS:3.0/AV:N/AC:L/PR:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write

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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