libvncserver: Multiple heap out-of-bound writes in VNC client code
Published Dec 19, 2018
9.8
CRITICALCVSS 3.1
EPSS 9.47%
Description
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution
Affected products
- Vendor n/a Product LibVNC Defaultn/a
- Version commit a83439b9fbe0f03c48eb94ed05729cb016f8b72fStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | LibVNC | n/a |
|
Configuration 1
- < 0.9.12
Configuration 2
- 14.04
- 16.04
- 16.04
- 18.04
- 18.10
Configuration 3
- 8.0
- 9.0
Configuration 4
- ≥ 3.0.0.0 · < 3.2.1.0
Running on/with
- n/a
Configuration 5
- ≥ 3.0.0.0 · < 3.2.1.0
Running on/with
- n/a
Configuration 6
- ≥ 3.0.0.0 · < 3.2.1.0
Running on/with
- n/a
Configuration 7
- ≥ 3.0.0.0 · < 3.2.1.0
Running on/with
- n/a
Configuration 8
- ≥ 3.0.0.0 · < 3.2.1.0
Running on/with
- n/a
Configuration 9
- ≥ 3.0.0.0 · < 3.2.1.0
Running on/with
- n/a
No data.
Red Hat Enterprise Linux 6
libvncserver
Will not fix
Red Hat Enterprise Linux 7
libvncserver
Affected
Red Hat Enterprise Linux 8
libvncserver
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | libvncserver | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | libvncserver | Affected | n/a |
| Red Hat Enterprise Linux 8 | libvncserver | Affected | n/a |
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
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 2, 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 (21 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 9.47% (0.09468) | 95.29th | v5 (v2026.06.15) |
| Jun 15, 2026 | 9.39% (0.09392) | 94.76th | v5 (v2026.06.15) |
| Apr 1, 2025 | 17.31% (0.17311) | 94.51th | v4 (v2025.03.14) |
| Mar 30, 2025 | 10.98% (0.10977) | 92.78th | v4 (v2025.03.14) |
| Mar 29, 2025 | 23.57% (0.23573) | 93.54th | v4 (v2025.03.14) |
| Mar 17, 2025 | 10.98% (0.10977) | 92.89th | v4 (v2025.03.14) |
| Nov 28, 2024 | 3.32% (0.03320) | 91.64th | v3 (v2023.03.01) |
| Oct 28, 2024 | 4.47% (0.04475) | 92.64th | v3 (v2023.03.01) |
| Jul 14, 2024 | 3.03% (0.03027) | 91.06th | v3 (v2023.03.01) |
| Jun 20, 2024 | 3.82% (0.03820) | 91.94th | v3 (v2023.03.01) |
| May 11, 2024 | 3.95% (0.03950) | 91.96th | v3 (v2023.03.01) |
| Dec 13, 2023 | 3.26% (0.03260) | 90.23th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.55% (0.02547) | 88.52th | v3 (v2023.03.01) |
| Mar 6, 2023 | 9.80% (0.09801) | 94.34th | v2 (v2022.01.01) |
| Apr 1, 2022 | 9.80% (0.09801) | 93.83th | v2 (v2022.01.01) |
| Feb 4, 2022 | 9.80% (0.09801) | 87.26th | v2 (v2022.01.01) |
| Feb 3, 2022 | 4.48% (0.04476) | 74.75th | v1 |
| Jan 6, 2022 | 4.48% (0.04476) | 74.54th | v1 |
| Dec 15, 2021 | 4.48% (0.04476) | 84.17th | v1 |
| Sep 1, 2021 | 4.04% (0.04044) | 83.24th | v1 |
| Apr 14, 2021 | 4.04% (0.04044) | 0.00th | v1 |
References (13)
- https://access.redhat.com/security/cve/CVE-2018-20019 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1661114 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf x_refsource_CONFIRMPatchThird Party Advisory
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-029-libvnc-multiple-heap-out-of-bound-vulnerabilities/ x_refsource_MISCBroken Link
- https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-20019
- https://security.gentoo.org/glsa/201908-05 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://usn.ubuntu.com/3877-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://usn.ubuntu.com/4547-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://usn.ubuntu.com/4587-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-20019
- https://www.debian.org/security/2019/dsa-4383 vendor-advisoryx_refsource_DEBIANThird Party Advisory
Change history (0)
No recorded changes yet.