CVE-2018-20748
CRITICAL
9.8
CVSS Score
Published: January 30, 2019 at 06:00 PM UTC
Updated: June 17, 2026 at 01:53 AM UTC
15 products affected across 4 vendorsDebian LinuxUbuntu LinuxLibVNCServer
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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Ubuntu Linux· Canonicalrubygems
95%Debian Linux· Debiandrupal
95%v < 0.9.12
Affected range stops below 0.9.12, so it looks safe — our inference, not a vendor statement
3.0.0.0 ≤ v < 3.2.1.0
Affected range stops below 3.2.1.0, so it looks safe — our inference, not a vendor statement
siemens-simatic-itc1500 (same device)
3.0.0.0 ≤ v < 3.2.1.0
Affected range stops below 3.2.1.0, so it looks safe — our inference, not a vendor statement
siemens-simatic-itc1500-pro (same device)
3.0.0.0 ≤ v < 3.2.1.0
Affected range stops below 3.2.1.0, so it looks safe — our inference, not a vendor statement
siemens-simatic-itc1900 (same device)
3.0.0.0 ≤ v < 3.2.1.0
Affected range stops below 3.2.1.0, so it looks safe — our inference, not a vendor statement
siemens-simatic-itc1900-pro (same device)
3.0.0.0 ≤ v < 3.2.1.0
Affected range stops below 3.2.1.0, so it looks safe — our inference, not a vendor statement
siemens-simatic-itc2200 (same device)
3.0.0.0 ≤ v < 3.2.1.0
Affected range stops below 3.2.1.0, so it looks safe — our inference, not a vendor statement
siemens-simatic-itc2200-pro (same device)
Simatic Itc1500· Siemensdevice
80%All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory 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
References (12)
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfx_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42baex_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2ax_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2cx_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/LibVNC/libvncserver/issues/273Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2019/01/msg00029.htmlMailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.htmlCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-787
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