CVE-2023-51091Public exploitNetwork attack vector

Remote code execution via oversized language cookie

Published Dec 26, 2023 · Updated Aug 2, 2024

Stack overflow in R7WebsSecurityHandler in Tenda M3 1.0.0.12(4856) allows remote attackers to execute code via an HTTP request. The proof of concept sends a 456-byte bLanguage cookie plus a return address to the handler, overrunning its stack. No authentication or user interaction is required; successful exploitation can run code or crash the router's web service.

CVSS severity9.8
Critical
EPSS probability8.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in R7WebsSecurityHandler in Tenda M3 1.0.0.12(4856) allows remote attackers to execute code via an HTTP request. The proof of concept sends a 456-byte bLanguage cookie plus a return address to the handler, overrunning its stack. No authentication or user interaction is required; successful exploitation can run code or crash the router's web service.

The record

CVE
CVE-2023-51091
Published
Dec 26, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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

9.8NIST 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-787Out-of-bounds Write
T1210Exploitation of Remote Services

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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