ICSA-20-343-08: Siemens Products using TightVNC (Update A)
CISA advisory · released 2020-12-08
Source record Collected from CISA's CSAF advisory feed
- Distribution label in the document: TLP:WHITE
- Revision 3, 2025-05-06 (final)
CISA's summary
Summary: Multiple TightVNC (V1.x) vulnerabilities could allow remote code execution and Denial-of-Service attacks under certain conditions. Siemens has previously released this advisory containing a set of products that were considered to be affected. Through Siemens' continuous investigation processes it was identified that all products previously advised are not affected by any vulnerability listed in this advisory.
Products, as the advisory lists them
| Vendor | Product | Version |
|---|---|---|
| Siemens | SIMATIC HMI Comfort Outdoor Panels 7" & 15" (incl. SIPLUS variants) | vers:all/* |
| Siemens | SIMATIC HMI Comfort Panels 4" - 22" (incl. SIPLUS variants) | vers:all/* |
| Siemens | SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 and KTP900F | vers:all/* |
| Siemens | SIMATIC ITC1500 V3.1 | vers:all/* |
| Siemens | SIMATIC ITC1500 V3.1 PRO | vers:all/* |
| Siemens | SIMATIC ITC1900 V3.1 | vers:all/* |
| Siemens | SIMATIC ITC1900 V3.1 PRO | vers:all/* |
| Siemens | SIMATIC ITC2200 V3.1 | vers:all/* |
| Siemens | SIMATIC ITC2200 V3.1 PRO | vers:all/* |
| Siemens | SIMATIC WinCC Runtime Advanced | vers:all/* |
| Siemens | SIMATIC WinCC Runtime Professional | vers:all/* |
DeSpy has not checked any unit, hardware revision or firmware.
Vulnerabilities in this advisory
- CVE-2019-8287 — CVE-2019-8287 · CWE-120
TightVNC code version 1.3.10 contains global buffer overflow in HandleCoRREBBP macro function, which can potentially result in code execution. This attack appear to be exploitable via network connectivity.
- CVE-2019-15678 — CVE-2019-15678 · CWE-122
TightVNC code version 1.3.10 contains heap buffer overflow in rfbServerCutText handler, which can potentially result in code execution. This attack appear to be exploitable via network connectivity.
- CVE-2019-15679 — CVE-2019-15679 · CWE-122
TightVNC code version 1.3.10 contains heap buffer overflow in InitialiseRFBConnection function, which can potentially result in code execution. This attack appear to be exploitable via network connectivity.
- CVE-2019-15680 — CVE-2019-15680 · CWE-476
TightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which could result in a Denial-of-Service (DoS). This attack appear to be exploitable via network connectivity.
Acknowledgments, as the advisory lists them
- Siemens ProductCERT: reporting these vulnerabilities to CISA.
The advisory's legal notice
Siemens Security Advisories are subject to the terms and conditions contained in Siemens' underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter "License Terms"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens' Global Website (https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.
Sources
DeSpy's copy of this version is dated 2026-09-28.
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