CVE-2021-29323

Device crash via Wi-Fi scan buffer overflow

Published Nov 19, 2021 · Updated Aug 3, 2024

Heap buffer overflow in Moddable 10.5.0 allows local users to crash an ESP device through Wi-Fi scan processing. The public record identifies modules/network/wifi/esp/modwifi.c, but neither the record nor its linked upstream issue discloses the incorrect allocation or write that overflows the heap buffer. Reaching the flaw requires local access and user interaction, and the documented consequence is limited to a device crash with no data access or modification.

CVSS severity5.5
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Moddable 10.5.0 allows local users to crash an ESP device through Wi-Fi scan processing. The public record identifies modules/network/wifi/esp/modwifi.c, but neither the record nor its linked upstream issue discloses the incorrect allocation or write that overflows the heap buffer. Reaching the flaw requires local access and user interaction, and the documented consequence is limited to a device crash with no data access or modification.

The record

CVE
CVE-2021-29323
Published
Nov 19, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 19, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 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-787Out-of-bounds Write
T1499Endpoint Denial of Service

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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