CVE-2019-8259
UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow...
UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1199.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1199.
- Record
CVE-2019-8259- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-665, CWE-401
- Updated
- 2026-11-02
CVE List No score
UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1199.
- Record
CVE-2019-8259- Weakness
- CWE-665
- Updated
- 2026-11-02
EUVDEUVD-2019-17657 No score
UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1199.
- Record
EUVD-2019-17657- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-mhxq-j55c-q97g
UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow...
UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1199.
- Record
GHSA-mhxq-j55c-q97g- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-401
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-8259 is a high vulnerability (CVSS 7.5) in Ultravnc, published March 5, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.01%, the 87th percentile. No source names a fixed version.
References
ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-005-ultravnc-memory-leak
cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
us-cert.gov/ics/advisories/icsa-20-161-06
us-cert.cisa.gov/ics/advisories/icsa-21-131-11
nvd.nist.gov/vuln/detail/CVE-2019-8259
github.com/advisories/GHSA-mhxq-j55c-q97g