UltraVNC Launcher 1.2.4.0 Host configuration stack-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in UltraVNC Launcher 1.2.4.0. The impacted element is an unknown function. This manipulation of the argument Host configuration causes stack-based overflow. This vulnerability is tracked as CVE-2020-37133. The attack is restricted to local execution. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in UltraVNC Launcher 1.2.4.0. It has been declared as critical. Affected by this vulnerability is an unknown functionality. The manipulation of the argument Host configuration with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

UltraVNC Launcher 1.2.4.0 contains a denial of service vulnerability in the Repeater Host configuration field that allows attackers to crash the application. Attackers can paste an overly long string of 300 characters into the Repeater Host property to trigger an application crash.

The weakness was disclosed by chuyreds as 48288. It is possible to read the advisory at exploit-db.com. This vulnerability is known as CVE-2020-37133 since 02/03/2026. The exploitation appears to be easy. Attacking locally is a requirement. Technical details and also a public exploit are known.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2020-31031). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Vendor

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 7.5
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/03/2026 CVE reserved
02/05/2026 +2 days Advisory disclosed
02/05/2026 +0 days VulDB entry created
02/10/2026 +5 days VulDB entry last update

Sourcesinfo

Advisory: 48288
Researcher: chuyreds
Status: Not defined

CVE: CVE-2020-37133 (🔒)
GCVE (CVE): GCVE-0-2020-37133
GCVE (VulDB): GCVE-100-344527
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/05/2026 18:00
Updated: 02/10/2026 02:17
Changes: 02/05/2026 18:00 (80), 02/06/2026 16:27 (1), 02/10/2026 02:17 (11)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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