CVE-2026-3787

mediumpriority · track · 0EPSS 0.002 · 7 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.17% (7th) EPSS

CVSS 6 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-28

A weakness has been identified in UltraVNC 1.6.4.0 on Windows. This affects an unknown function in the library cryptbase.dll of the component Windows Service. This manipulation causes uncontrolled search path. The attack requires local access. A high degree of complexity is needed for the attack. The exploitability is reported as difficult. The vendor was contacted early about this disclosure but did not respond in any way.

cvss

Technical severity, 0–10. One row per scoring source.

7.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.4–7.3

v2.06mediumAV:L/AC:H/Au:S/C:C/I:C/A:Csecondary · cna@vuldb.comexploitability 1.5 · impact 10

v3.17highCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · cna@vuldb.comexploitability 1 · impact 5.9

v4.07.3highCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:Psecondary · ENISA EU

v4.06.4mediumCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · cna@vuldb.com

v4.04.4mediumCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-426USprimaryCWE-427US

affected products (3)

Products and version ranges known to be affected.

UltraVNC UltraVNC 1.6.4.0all versionscert_bundDEcpe:/a:ultravnc:ultravnc:1.6.4.0
n/a UltraVNC≤ 1.6.4.0enisa_euvdEU
uvnc ultravnc= 1.6.4.0nvdUScpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0637UltraVNC: Schwachstelle ermöglicht CodeausführungDeutsch2026-03-08csaf · cert_bundDE
Ein lokaler Angreifer kann eine Schwachstelle in UltraVNC ausnutzen, um beliebigen Programmcode auszuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2026-03-08modified 2026-06-17

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+1300 more

references (13)

External citations — patches, advisories, analysis.

scry

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