CVE-2021-38278Public exploitNetwork attack vector

Unauthenticated web-service crash via unbounded urls copy

Published Mar 23, 2022 · Updated Aug 4, 2024

Heap buffer overflow in Tenda AC10-1200 15.03.06.23_EN allows remote attackers to crash the web server via a crafted request. The saveParentControlInfo handler reads the urls POST parameter with websGetVar and passes it to strcpy without bounding the copy into a heap allocation. No authentication or user interaction is required; the demonstrated consequence is interruption of the management web service, not code execution.

CVSS severity9.8
Critical
EPSS probability1.41%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Tenda AC10-1200 15.03.06.23_EN allows remote attackers to crash the web server via a crafted request. The saveParentControlInfo handler reads the urls POST parameter with websGetVar and passes it to strcpy without bounding the copy into a heap allocation. No authentication or user interaction is required; the demonstrated consequence is interruption of the management web service, not code execution.

The record

CVE
CVE-2021-38278
Published
Mar 23, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 2022CVE 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

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

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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