What is the CVSS score of EUVD-2026-33969?

EUVD-2026-33969 has a CVSS 3.1 base score of 6.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L. EPSS exploitation probability: 0.1%.

VIVOTEK FD8136 EUVD-2026-33969

| CVE-2026-35716 MEDIUM

Stack-based Buffer Overflow (CWE-121)

2026-06-02 mitre

GHSA-pj36-9w4r-h2r4

RCE Buffer Overflow Stack Overflow N A

6.3

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

6.3 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Primary rating from Vendor (mitre) · only source for this CVE.

CVSS VectorVendor: mitre

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Lifecycle Timeline

Analysis Generated

Jun 03, 2026 - 14:23 vuln.today

CVSS changed

Jun 03, 2026 - 14:22 NVD

6.3 (MEDIUM)

CVE Published

Jun 02, 2026 - 00:00 nvd

UNKNOWN (no severity yet)

DescriptionCVE.org

A stack-based buffer overflow in the motion_privacy.cgi binary in VIVOTEK FD8136 firmware FD8136-VVTK-0300a allows authenticated remote attackers to execute arbitrary code as root via an oversized n1 parameter in a POST request to the /cgi-bin/admin/setpm.cgi, /cgi-bin/admin/setmd.cgi, or /cgi-bin/admin/setmd_profile.cgi endpoint (all symlinks to the same binary). The parameter value is copied into a fixed-size 0xa4-byte stack buffer without bounds checking, overwriting the saved link register. The binary is compiled without stack canaries.

AnalysisAI

Stack-based buffer overflow in VIVOTEK FD8136 firmware FD8136-VVTK-0300a grants authenticated remote attackers root-level code execution by supplying an oversized POST parameter to any of three symlinked CGI admin endpoints. The vulnerable motion_privacy.cgi binary copies the n1 parameter into a fixed 164-byte (0xa4) stack buffer with no bounds check and no stack canary protection, overwriting the saved link register and diverting execution to attacker-controlled code. A public proof-of-concept is available on GitHub; no active exploitation has been confirmed in CISA KEV at time of analysis.

Technical ContextAI

The root cause is CWE-121 (Stack-based Buffer Overflow) in the motion_privacy.cgi CGI binary embedded in VIVOTEK FD8136 firmware. Three admin endpoints - /cgi-bin/admin/setpm.cgi, /cgi-bin/admin/setmd.cgi, and /cgi-bin/admin/setmd_profile.cgi - are filesystem symlinks to this single binary, meaning all three paths are equally exploitable. The n1 POST parameter is copied into a stack-allocated buffer of exactly 0xa4 (164) bytes using an unsafe operation with no length validation. Overwriting the saved link register (rather than a return address on x86) indicates the device likely runs an ARM-based SoC, which is standard for embedded IP cameras. The absence of stack canaries removes the primary compile-time detection mechanism for this class of overflow. The NVD CPE entry (cpe:2.3:a:n/a:n/a) is uninformative and does not provide version-range precision beyond what the CVE description states.

RemediationAI

No vendor-released patch or updated firmware version has been identified from the available data - the references include only the vendor's homepage and the researcher's GitHub PoC, with no VIVOTEK security advisory or patched firmware release number. Monitor http://vivotek.com for firmware updates targeting FD8136-VVTK-0300a. Until a patch is available, restrict network access to the three vulnerable endpoints (/cgi-bin/admin/setpm.cgi, /cgi-bin/admin/setmd.cgi, /cgi-bin/admin/setmd_profile.cgi) via perimeter firewall or VLAN segmentation, ensuring these cameras are not reachable from untrusted networks; this is the highest-impact compensating control and eliminates the AV:N attack vector entirely at the cost of remote admin access. Additionally, enforce strong, unique administrative credentials across all FD8136 units to raise the bar for the PR:L authentication prerequisite - default or weak credentials would allow any network-reachable attacker to exploit this. The PoC at https://github.com/xchg-rax-rax/vulnerability-research/tree/main/CVE-2026-35716 can be used in a lab environment to validate whether a future firmware update actually resolves the overflow.