Resource exhaustion in Ultravnc Team Viewer
CVE-2020-37134
UltraVNC Viewer 1.2.4.0 contains a denial of service vulnerability that allows attackers to crash the application by manipulating VNC Server input. Attackers can generate a malformed 256-byte payload and paste it into the VNC Server connection dialog to trigger an application crash.
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:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (29.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Ultravnc Team Viewer — versions 1.2.4.0
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/48291 (exploit)
- www.uvnc.com/ (product)
- www.vulncheck.com/advisories/ultravnc-viewer-vncserver-denial-of-service (third-party-advisory)
Frequently asked questions
- What is CVE-2020-37134?
- CVE-2020-37134 is a high-severity vulnerability in Ultravnc Team Viewer, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-02-05.
- How severe is CVE-2020-37134?
- High severity. CVSS v3 base score is 7.5 out of 10.