CVE-2019-8266
9.8
CRITICAL · CVSS 3.0 · EPSS 2.8% (pctl 86)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
UltraVNC revision 1207 has multiple out-of-bounds access vulnerabilities connected with improper usage of ClientConnection::Copybuffer function in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. User interaction is required to trigger these vulnerabilities. These vulnerabilities have been fixed in revision 1208.
Scoring
| CVSS | 9.8 (CRITICAL, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 2.84% — more likely to be exploited than 86% of all CVEs |
| Weakness | CWE-788 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2019-03-08 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| uvnc | ultravnc |
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-013-ultravnc-access-of-memory-location-after-end-of-buffer/
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-013-ultravnc-access-of-memory-location-after-end-of-buffer/
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06
→ the Explorer · watch your stack · NVD