CVE-2026-30649Public exploitNetwork attack vector

Pre-auth root code execution via unbounded sprintf

Published Jun 2, 2026 · Updated Jun 2, 2026

Stack-based buffer overflow in VIVOTEK FD8136 firmware 0300a allows remote attackers to execute arbitrary code through an anonymous CGI endpoint. The set_get_param function passes an unbounded POST body to sprintf, which overwrites a fixed-size stack buffer and its saved return address. The anonymous setparam.cgi route requires no authentication, and successful exploitation redirects execution to attacker-supplied code as root.

CVSS severity7.3
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in VIVOTEK FD8136 firmware 0300a allows remote attackers to execute arbitrary code through an anonymous CGI endpoint. The set_get_param function passes an unbounded POST body to sprintf, which overwrites a fixed-size stack buffer and its saved return address. The anonymous setparam.cgi route requires no authentication, and successful exploitation redirects execution to attacker-supplied code as root.

The record

CVE
CVE-2026-30649
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record 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

7.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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