UltraVNC revision 1210 has out-of-bounds read vulnerability in VNC client code inside Ultra decoder, which results in a denial of service (…

published 2019-03-08 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-17668

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.9%; EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits: 0; none known

UltraVNC revision 1210 has out-of-bounds read vulnerability in VNC client code inside Ultra decoder, which results in a denial of service (DoS) condition. This attack appear to be exploitable via network connectivity. This vulnerability has been fixed in revision 1211.

Patch / fix

fixed in 1

uvnc ultravnc 1.2.2.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-161-06 updated 2020-06-09 cvss 7.5

Siemens SINUMERIK

Siemens SINUMERIK Access MyMachine /P2P <V4.8
affected: fixed in V4.8, mitigation
Siemens SINUMERIK PCU base Win7 software /IPC <V12.01_HF4
affected: fixed in V12.01, mitigation
Siemens SINUMERIK PCU base Win10 software /IPC <V14.00
affected: fixed in V14.00, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

1.95% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

Kaspersky Lab UltraVNC

Classification

Weakness

CWE-125 Out-of-bounds Read

References

Sources

CVE List CVE-2019-8270
NVD CVE-2019-8270

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary