libvncserver: Heap out-of-bounds write in rfbserver.c in rfbProcessFileTransferReadBuffer() allows for potential code execution (Incomplete fix for CVE-2018-15127)
Published Jan 30, 2019
9.8
CRITICALCVSS 3.1
EPSS 3.23%
Description
LibVNC before 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.
Affected products
No data.
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
Not affected
Red Hat Enterprise Linux 8
libvncserver
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | libvncserver | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | libvncserver | Not affected | n/a |
| Red Hat Enterprise Linux 8 | libvncserver | Not 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:H/PR:L/UI:N/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 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (22 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 3.23% (0.03230) | 87.83th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.23% (0.03230) | 86.59th | v5 (v2026.06.15) |
| Dec 28, 2025 | 10.72% (0.10724) | 93.08th | v4 (v2025.03.14) |
| Dec 27, 2025 | 8.04% (0.08043) | 91.86th | v4 (v2025.03.14) |
| Oct 28, 2025 | 10.90% (0.10905) | 93.05th | v4 (v2025.03.14) |
| Oct 27, 2025 | 8.19% (0.08185) | 91.81th | v4 (v2025.03.14) |
| Oct 1, 2025 | 10.90% (0.10905) | 93.16th | v4 (v2025.03.14) |
| Jul 30, 2025 | 8.19% (0.08185) | 91.82th | v4 (v2025.03.14) |
| Mar 30, 2025 | 10.90% (0.10905) | 92.75th | v4 (v2025.03.14) |
| Mar 29, 2025 | 15.46% (0.15458) | 91.13th | v4 (v2025.03.14) |
| Mar 17, 2025 | 10.90% (0.10905) | 92.86th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.39% (0.00385) | 73.98th | v3 (v2023.03.01) |
| Jun 22, 2024 | 0.48% (0.00477) | 75.91th | v3 (v2023.03.01) |
| Mar 22, 2024 | 0.47% (0.00470) | 75.07th | v3 (v2023.03.01) |
| Jan 24, 2024 | 0.47% (0.00470) | 73.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.43% (0.00425) | 70.32th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.27% (0.02273) | 50.89th | v5 (v2026.06.15) |
| Dec 15, 2021 | 2.27% (0.02273) | 78.43th | v1 |
| Sep 1, 2021 | 2.07% (0.02069) | 77.27th | v1 |
| Apr 14, 2021 | 2.07% (0.02069) | 0.00th | v1 |
References (14)
- http://www.securityfocus.com/bid/106825 vdb-entryx_refsource_BIDBroken Link
- https://access.redhat.com/security/cve/CVE-2018-20749 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1671403 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf x_refsource_CONFIRMPatchThird Party Advisory
- https://github.com/LibVNC/libvncserver/commit/15bb719c03cc70f14c36a843dcb16ed69b405707 x_refsource_MISCPatchThird Party Advisory
- https://github.com/LibVNC/libvncserver/issues/273 x_refsource_MISCIssue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html mailing-listx_refsource_MLISTThird 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-2018-20749
- 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-2018-20749
- https://www.openwall.com/lists/oss-security/2018/12/10/8 x_refsource_MISCExploitMailing ListThird Party Advisory
Change history (0)
No recorded changes yet.