# uvnc UltraVNC.

Every CVE that names uvnc UltraVNC among its affected products, newest first. Vendors and products are as the CNA wrote them.

## Records, newest first

- [UltraVNC repeater HTTP server global buffer overflow via long URI (pre-auth RCE)](https://agentprime.io/advisories/CVE-2026-7840.md)
  `CVE-2026-7840` · CVE record: uvnc UltraVNC · CVSS 9.3 Critical · Critical (CVSS 9+) · Not analysed yet · Published 1 Jul 2026 · Tags: Memory corruption
- [UltraVNC repeater ships hardcoded default admin password allowing unauthenticated admin access](https://agentprime.io/advisories/CVE-2026-7839.md)
  `CVE-2026-7839` · CVE record: uvnc UltraVNC · CVSS 9.1 Critical · Critical (CVSS 9+) · Not analysed yet · Published 1 Jul 2026 · Tags: Hard-coded credentials
- [UltraVNC viewer heap buffer overflow via integer overflow in RFB connection-failure reason length](https://agentprime.io/advisories/CVE-2026-7838.md)
  `CVE-2026-7838` · CVE record: uvnc UltraVNC · CVSS 8.7 High · Not analysed yet · Published 1 Jul 2026 · Tags: Memory corruption
- [UltraVNC viewer off-by-one stack overflow in ServerInit desktop name parsing](https://agentprime.io/advisories/CVE-2026-7831.md)
  `CVE-2026-7831` · CVE record: uvnc UltraVNC · CVSS 7.5 High · Not analysed yet · Published 1 Jul 2026 · Tags: Memory corruption, CWE-193
- [UltraVNC MS-Logon II uses 64-bit Diffie-Hellman and seeded libc rand() enabling credential interception](https://agentprime.io/advisories/CVE-2026-7830.md)
  `CVE-2026-7830` · CVE record: uvnc UltraVNC · CVSS 7.4 High · Not analysed yet · Published 1 Jul 2026 · Tags: Weak cryptography or TLS
- [UltraVNC repeater authenticated out-of-bounds write in rule parser via oversized token](https://agentprime.io/advisories/CVE-2026-7829.md)
  `CVE-2026-7829` · CVE record: uvnc UltraVNC · CVSS 7.2 High · Not analysed yet · Published 1 Jul 2026 · Tags: Memory corruption
- [UltraVNC repeater integer overflow in win_log malloc leading to heap overflow](https://agentprime.io/advisories/CVE-2026-7828.md)
  `CVE-2026-7828` · CVE record: uvnc UltraVNC · CVSS 5.3 Medium · Not analysed yet · Published 1 Jul 2026 · Tags: Memory corruption
- [UltraVNC vncauth.c uses time-seeded libc rand() to generate VNC authentication challenge bytes](https://agentprime.io/advisories/CVE-2026-44040.md)
  `CVE-2026-44040` · CVE record: uvnc UltraVNC · CVSS 4.8 Medium · Not analysed yet · Published 1 Jul 2026 · Tags: Weak cryptography or TLS
- [UltraVNC vncWc2Mb calls wcslen() before validating that the wide string is NUL-terminated](https://agentprime.io/advisories/CVE-2026-44041.md)
  `CVE-2026-44041` · CVE record: uvnc UltraVNC · CVSS 4.3 Medium · Not analysed yet · Published 1 Jul 2026 · Tags: Memory corruption
- [UltraVNC repeater wi_uudecode off-by-one in base64 decode boundary check](https://agentprime.io/advisories/CVE-2026-44042.md)
  `CVE-2026-44042` · CVE record: uvnc UltraVNC · CVSS 3.7 Low · Not analysed yet · Published 1 Jul 2026 · Tags: CWE-193

## Filters and formats

Filters are query parameters on this URL: `q` (words, as in a web search engine: `"a phrase"`, `OR`, `-word`; an id; a package or product name), `severity` (low, medium, high or critical), `critical=1`, `kev=1`, `ecosystem` (npm, pypi, packagist, go, maven, rubygems, crates, nuget, hex), `kind=package`, `assigner` (a CNA’s short name), `min_score` and `state`. Each record’s title links to its Markdown page.

- The same list as JSON: <https://api.agentprime.io/v1/advisories?technology=uvnc-ultravnc>
- Every list: <https://agentprime.io/advisories.md>, critical: <https://agentprime.io/advisories/critical.md>; by weakness: <https://agentprime.io/advisories/tag/sql-injection.md> and the other tags in <https://agentprime.io/llms.txt>; by technology: `/advisories/technology/<slug>.md` (`fortinet-fortimail`)

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The web page: <https://agentprime.io/advisories/technology/uvnc-ultravnc/>. Everything for agents: <https://agentprime.io/llms.txt>.