CVE-2018-15361
UltraVNC revision 1198 has a buffer underflow vulnerability in VNC client code, which can potentially result in code execution.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.88%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
UltraVNC revision 1198 has a buffer underflow vulnerability in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1199.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.88% probability · 87th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-124, CWE-787
- Affected
- uvnc/ultravnc
- Source
- vulnerability@kaspersky.com
EPSS 2.9% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-003-ultravnc-buffer-underwrite/Third Party Advisory
- 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-19-003-ultravnc-buffer-underwrite/Third Party Advisory
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.