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    CVE-2019-8264

    UltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside Ultra2 decoder, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1204.

    Published:Mar 8, 2019
    Last Modified:Nov 21, 2024
    EPS:Mar 9, 2019
    EPSS Score:0.0174
    CVSS Score:9.8

    Affected Products

    Vendor
    Uvnc
    Product
    Ultravnc

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-7840 (CVSS 9.3) — UltraVNC repeater through 1.8.2.2 contains a global buffer overflow in its embedded HTTP administration server…
    CVE-2026-7839 (CVSS 9.1) — UltraVNC repeater through 1.8.2.2 initializes the HTTP administration server with a hardcoded default password…
    CVE-2026-7838 (CVSS 8.7) — UltraVNC viewer through 1.8.2.2 contains an integer overflow leading to a heap buffer overflow in the RFB prot…
    CVE-2026-7831 (CVSS 7.6) — UltraVNC viewer through 1.8.2.2 contains an off-by-one stack buffer overflow in the RFB ServerInit message han…
    CVE-2026-7830 (CVSS 7.4) — UltraVNC through 1.8.2.2 uses inadequate cryptography in the MS-Logon II authentication scheme (rfbUltraVNC_Ms…
    CVE-2026-7829 (CVSS 7.2) — UltraVNC repeater through 1.8.2.2 contains a post-authentication out-of-bounds write in the allow/deny rule pa…
    CVE-2026-7828 (CVSS 5.3) — UltraVNC repeater through 1.8.2.2 contains an integer overflow in the HTTP request logging path. In repeater/w…
    CVE-2026-44040 (CVSS 4.8) — UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentic…
    CVE-2026-44041 (CVSS 4.3) — UltraVNC through 1.8.2.2 contains an out-of-bounds read in the wide-string to multibyte conversion helper. In …
    CVE-2026-44042 (CVSS 3.7) — UltraVNC repeater through 1.8.2.2 contains an off-by-one error in the Base64 decode helper used for HTTP Basic…

    References

    https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
    https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
    https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
    https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-011-ultravnc-access-of-memory-location-after-end-of-buffer/
    https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11
    https://www.us-cert.gov/ics/advisories/icsa-20-161-06
    https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
    https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
    https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
    https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-011-ultravnc-access-of-memory-location-after-end-of-buffer/
    https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11
    https://www.us-cert.gov/ics/advisories/icsa-20-161-06

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High