CVE-2021-35392Network attack vector

Remote service crash via unsafe SSDP crafting

Published Aug 16, 2021 · Updated Aug 4, 2024

A heap buffer overflow in Realtek Jungle SDK 2.0 through 3.4.14B allows remote attackers to crash affected devices via SSDP. The WiFi Simple Config server, typically wscd or mini_upnpd, builds SSDP NOTIFY messages from an M-SEARCH ST header without safely bounding the resulting heap buffer. No authentication or user interaction is required, but the service must be network-reachable; published impact is limited to a service crash.

CVSS severity7.5
High
EPSS probability83.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A heap buffer overflow in Realtek Jungle SDK 2.0 through 3.4.14B allows remote attackers to crash affected devices via SSDP. The WiFi Simple Config server, typically wscd or mini_upnpd, builds SSDP NOTIFY messages from an M-SEARCH ST header without safely bounding the resulting heap buffer. No authentication or user interaction is required, but the service must be network-reachable; published impact is limited to a service crash.

The record

CVE
CVE-2021-35392
Published
Aug 16, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

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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