CVE-2023-27063Public exploitNetwork attack vector

Service interruption via unchecked DNS forwarding fields

Published Mar 13, 2023 · Updated Feb 27, 2025

Buffer overflow in Tenda W15E firmware 15.11.0.14 allows remote attackers to interrupt the HTTP service via a crafted DNS forwarding request. The formModifyDnsForward handler in /bin/httpd passes unchecked DNSDomainName and related request fields to sprintf, overflowing a fixed-size buffer. The network management endpoint requires no privileges, and the published proof of concept demonstrates denial of service; return-address overwrite is reported, but code execution is not demonstrated.

CVSS severity9.8
Critical
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Tenda W15E firmware 15.11.0.14 allows remote attackers to interrupt the HTTP service via a crafted DNS forwarding request. The formModifyDnsForward handler in /bin/httpd passes unchecked DNSDomainName and related request fields to sprintf, overflowing a fixed-size buffer. The network management endpoint requires no privileges, and the published proof of concept demonstrates denial of service; return-address overwrite is reported, but code execution is not demonstrated.

The record

CVE
CVE-2023-27063
Published
Mar 13, 2023
Updated
Feb 27, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2025Record 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

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

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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