CVE-2018-20748
9.8
CRITICAL · CVSS 3.1 · EPSS 3.3% (pctl 88)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 3.26% — more likely to be exploited than 88% of all CVEs |
| Weakness | CWE-787 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2019-01-30 |
| Last modified | 2026-06-17 |
Affected (15)
| Vendor | Product |
|---|---|
| canonical | ubuntu linux |
| debian | debian linux |
| libvnc project | libvncserver |
| siemens | simatic itc1500 |
| siemens | simatic itc1500 firmware |
| siemens | simatic itc1500 pro |
| siemens | simatic itc1500 pro firmware |
| siemens | simatic itc1900 |
| siemens | simatic itc1900 firmware |
| siemens | simatic itc1900 pro |
| siemens | simatic itc1900 pro firmware |
| siemens | simatic itc2200 |
| siemens | simatic itc2200 firmware |
| siemens | simatic itc2200 pro |
| siemens | simatic itc2200 pro firmware |
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
- https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae
- https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7
- https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2a
- https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c
- https://github.com/LibVNC/libvncserver/issues/273
- https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html
- https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
- https://usn.ubuntu.com/3877-1/
- https://usn.ubuntu.com/4547-1/
- https://usn.ubuntu.com/4587-1/
- https://www.openwall.com/lists/oss-security/2018/12/10/8
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
- https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae
- https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7
- https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2a
- https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c
- https://github.com/LibVNC/libvncserver/issues/273
- https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html
- https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
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