UltraVNC revision 1203 has multiple heap buffer overflow vulnerabilities in VNC client code inside Ultra decoder, which results in code execution
Published Mar 5, 2019
9.8
CRITICALCVSS 3.1
EPSS 4.84%
Description
UltraVNC revision 1203 has multiple heap buffer overflow vulnerabilities in VNC client code inside Ultra decoder, which results in code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1204.
Affected products
-
- Version 1.2.2.3StatusaffectedConstraints-
- Version
Configuration 2
- < 4.8
- < 14.00
- ≤ 12.01
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.84% (0.04843) | 91.73th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.84% (0.04843) | 90.84th | v5 (v2026.06.15) |
| Nov 21, 2025 | 6.18% (0.06178) | 90.43th | v4 (v2025.03.14) |
| Nov 18, 2025 | 8.16% (0.08159) | 91.31th | v4 (v2025.03.14) |
| Apr 2, 2025 | 6.18% (0.06178) | 89.93th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.38% (0.02380) | 83.56th | v4 (v2025.03.14) |
| Mar 29, 2025 | 5.42% (0.05422) | 83.21th | v4 (v2025.03.14) |
| Jul 20, 2024 | 1.24% (0.01243) | 85.66th | v3 (v2023.03.01) |
| Feb 23, 2024 | 1.24% (0.01243) | 85.08th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.28% (0.01280) | 83.58th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.76% (0.02762) | 82.95th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.76% (0.02762) | 81.27th | v2 (v2022.01.01) |
| Feb 4, 2022 | 21.30% (0.21296) | 94.16th | v2 (v2022.01.01) |
| Feb 3, 2022 | 10.45% (0.10445) | 87.57th | v1 |
| Jan 6, 2022 | 10.45% (0.10445) | 87.43th | v1 |
| Sep 1, 2021 | 2.53% (0.02534) | 78.81th | v1 |
| Jun 29, 2021 | 2.53% (0.02534) | 0.00th | v1 |
| May 12, 2021 | 2.18% (0.02177) | 0.00th | v1 |
| Apr 14, 2021 | 1.46% (0.01458) | 0.00th | v1 |
References (6)
- https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf x_refsource_CONFIRM
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf x_refsource_CONFIRMThird Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf x_refsource_CONFIRM
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-008-ultravnc-heap-based-buffer-overflow/ x_refsource_MISCThird Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11 x_refsource_MISC
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06 x_refsource_MISCThird Party AdvisoryUS Government Resource
| Link | Providers | Tags |
|---|---|---|
| https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf | x_refsource_CONFIRM | |
| https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf | x_refsource_CONFIRMThird Party Advisory | |
| https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf | x_refsource_CONFIRM | |
| https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-008-ultravnc-heap-based-buffer-overflow/ | x_refsource_MISCThird Party Advisory | |
| https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11 | x_refsource_MISC | |
| https://www.us-cert.gov/ics/advisories/icsa-20-161-06 | x_refsource_MISCThird Party AdvisoryUS Government Resource |
Change history (0)
No recorded changes yet.