Buffer overflow in Ultravnc Team Launcher
CVE-2020-37133
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Ultravnc Team Launcher — versions 1.2.4.0
- Uvnc Ultravnc
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/48288 (Exploit, VDB Entry, Third Party Advisory, exploit)
- www.uvnc.com/ (Product, product)
- www.vulncheck.com/advisories/ultravnc-launcher-repeaterhost-denial-of-service (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2020-37133?
- CVE-2020-37133 is a high-severity vulnerability in Ultravnc Team Launcher, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-02-05.
- How severe is CVE-2020-37133?
- High severity. CVSS v3 base score is 7.5 out of 10.