libvncserver: Heap-based buffer overflow in ultra.c
Published Dec 31, 2016
9.8
CRITICALCVSS 3.0
EPSS 3.75%
Description
Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.
Affected products
No data.
- 0.9.10
No data.
Red Hat Enterprise Linux 6
libvncserver
Will not fix
Red Hat Enterprise Linux 7
libvncserver
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | libvncserver | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | libvncserver | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/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 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.75% (0.03748) | 89.52th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.72% (0.03717) | 88.32th | v5 (v2026.06.15) |
| May 27, 2026 | 1.66% (0.01661) | 82.31th | v4 (v2025.03.14) |
| Mar 30, 2025 | 0.62% (0.00617) | 67.46th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.38% (0.02377) | 74.96th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.62% (0.00617) | 68.15th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.24% (0.01243) | 86.10th | v3 (v2023.03.01) |
| Apr 2, 2024 | 1.24% (0.01243) | 85.23th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.08% (0.01082) | 82.05th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.71% (0.02714) | 82.86th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.71% (0.02714) | 81.18th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.71% (0.02714) | 62.68th | v2 (v2022.01.01) |
References (11)
- http://www.debian.org/security/2017/dsa-3753 vendor-advisoryx_refsource_DEBIAN
- http://www.securityfocus.com/bid/95170 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2016-9942 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1410168 Issue Tracking
- https://github.com/LibVNC/libvncserver/pull/137 x_refsource_CONFIRM
- https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11 x_refsource_CONFIRM
- https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2016-9942
- https://security.gentoo.org/glsa/201702-24 vendor-advisoryx_refsource_GENTOO
- https://usn.ubuntu.com/4587-1/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2016-9942
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2017/dsa-3753 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.securityfocus.com/bid/95170 | vdb-entryx_refsource_BID | |
| https://access.redhat.com/security/cve/CVE-2016-9942 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1410168 | Issue Tracking | |
| https://github.com/LibVNC/libvncserver/pull/137 | x_refsource_CONFIRM | |
| https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11 | x_refsource_CONFIRM | |
| https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html | mailing-listx_refsource_MLIST | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-9942 | ||
| https://security.gentoo.org/glsa/201702-24 | vendor-advisoryx_refsource_GENTOO | |
| https://usn.ubuntu.com/4587-1/ | vendor-advisoryx_refsource_UBUNTU | |
| https://www.cve.org/CVERecord?id=CVE-2016-9942 |
Change history (0)
No recorded changes yet.