CVE intelligence and bounded remediation

CVE-2019-8259 — Uvnc Ultravnc security vulnerability

High CVSS 7.5

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.

Severity
High
CVSS
7.5 (3.1)
Published
2019-03-05
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-665, CWE-401

Affected products

  • uvnc / ultravnc
  • siemens / sinumerik_access_mymachine/p2p
  • siemens / sinumerik_pcu_base_win10_software/ipc
  • siemens / sinumerik_pcu_base_win7_software/ipc

Matched remediation archetype

Resource exhaustion and denial of service

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Identify attacker-influenced work factors including input size, nesting, compression, fan-out, regex cost, allocation, recursion, retries, and connection lifetime.
  • Map per-request and shared CPU, memory, disk, descriptor, thread, queue, and downstream-service limits.
  • Determine whether authentication, tenancy, quotas, and rate controls apply before expensive processing begins.

Remediate safely

  • Bound input size, nesting, expansion, work, concurrency, queue depth, retries, and execution time before resource-intensive processing.
  • Release resources on every success, error, cancellation, and timeout path and use backpressure instead of unbounded buffering.
  • Update affected components and add small deterministic tests that assert resource ceilings rather than exhausting a host.

Authoritative sources

Complete CVE record and remediation plan

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