HOMEVULNERABILITIESCVE-2019-8264
CRITICAL

CVE-2019-8264

CWE-788Published: March 8, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

UltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside Ultra2 decoder, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1204.

NVD Source

Technical Analysis

CVE-2019-8264 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

uvnc1 product(s)
ultravnc
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-011-ultravnc-access-of-memory-location-after-end-of-buffer/
ADVISORYhttps://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-011-ultravnc-access-of-memory-location-after-end-of-buffer/

All References (12)

→
https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
→
https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
→
https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
→
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-011-ultravnc-access-of-memory-location-after-end-of-buffer/Third Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11
→
https://www.us-cert.gov/ics/advisories/icsa-20-161-06
→
https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
→
https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
→
https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
→
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-011-ultravnc-access-of-memory-location-after-end-of-buffer/Third Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11
→
https://www.us-cert.gov/ics/advisories/icsa-20-161-06

Quick Facts

CVE IDCVE-2019-8264
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-788
CISA KEVNo
Affected1 vendor(s)
PublishedMar 8, 2019

Related CVEs (CWE-788)

CVE-2021-27384
9.8
CVE-2019-8280
9.8
CVE-2019-8266
9.8
CVE-2019-8265
9.8
CVE-2021-21104
8.8
CVE-2021-32629
8.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-8264 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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