CVE-2022-36436

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.7%, top 25% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator authentication-bypass vulnerability that could allow a malicious actor to gain unauthorized access to a VNC session or to disconnect a legitimate user from a VNC session. A remote attacker with network access to the proxy server could leverage this vulnerability to connect to VNC servers protected by the proxy server without providing any authentication credentials. Exploitation of this issue requires that the proxy server is currently accepting connections for the target VNC server.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation2% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
75.0%
KEV
Not listed

Published

September 14, 2022

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated May 25, 2026
Patch available. Sources: github_commit.
generic

VNCAuthProxy · PyPI

https://pypi.org/project/VNCAuthProxy/
generic

GitHub - osuosl/twisted_vncauthproxy at release/1.1.1 · GitHub

https://github.com/osuosl/twisted_vncauthproxy/tree/release/1.1.1
github_commit Patch Available

commit edc149af2924 (osuosl/twisted_vncauthproxy)

Patch available: osuosl/twisted_vncauthproxy 1.2.0 (contains commit edc149af2924)

https://github.com/osuosl/twisted_vncauthproxy/commit/edc149af29242178091b2d6fcd42c3ef0851644b
generic Patch Available

CVE-2022-36436: Twisted VNC Authentication Proxy authentication bypass | GRNET CERT

https://cert.grnet.gr/en/blog/cve-2022-36436-twisted-vnc-authentication-proxy-authentication-bypass/

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
vncauthproxy0.9, 1.0, 1.1.11.2.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-07-23 14:16 UTCEPSS rescore
  2. 2026-07-23 02:12 UTCEG score recompute
  3. 2026-07-22 22:59 UTCEG score recompute
  4. 2026-07-22 14:06 UTCEPSS rescore
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  12. 2026-07-18 10:03 UTCEPSS rescore
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  14. 2026-07-16 20:20 UTCOSV refresh
  15. 2026-07-16 17:00 UTCEPSS rescore
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  1. 2026-07-08 15:12 UTCEPSS rescore
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  13. 2026-06-29 14:04 UTCEPSS rescore
  14. 2026-06-28 18:32 UTCOSV refresh
  15. 2026-06-28 14:06 UTCEPSS rescore
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  22. 2026-06-24 14:03 UTCEPSS rescore
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  24. 2026-06-23 21:31 UTCEPSS rescore
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  28. 2026-06-21 14:55 UTCEPSS rescore
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  40. 2026-06-14 23:15 UTCEPSS rescore
  41. 2026-06-13 22:58 UTCEPSS rescore
  42. 2026-06-12 23:10 UTCEPSS rescore
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  44. 2026-06-11 13:58 UTCEPSS rescore
  45. 2026-06-11 13:58 UTCEPSS rescore
  46. 2026-06-11 11:09 UTCOSV refresh
  47. 2026-06-10 22:17 UTCEPSS rescore
  48. 2026-06-10 13:20 UTCEPSS rescore
  49. 2026-06-08 14:15 UTCEPSS rescore
  50. 2026-06-08 14:15 UTCEPSS rescore
  51. 2026-06-07 15:23 UTCEPSS rescore
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  53. 2026-06-05 22:46 UTCEPSS rescore
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  55. 2026-06-05 06:09 UTCEPSS rescore
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  63. 2026-05-31 22:29 UTCEPSS rescore
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  68. 2026-05-29 13:43 UTCEPSS rescore
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  72. 2026-05-27 13:39 UTCEPSS rescore
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  74. 2026-05-26 13:43 UTCEPSS rescore
  75. 2026-05-26 13:43 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2022-36436?
CVE-2022-36436 is a critical vulnerability published on September 14, 2022. OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator authentication-bypass vulnerability that could allow a malicious actor to gain unauthorized access to a VNC session or to disconnect a legitimate user from a VNC session. A remote attacker…
When was CVE-2022-36436 disclosed?
CVE-2022-36436 was first published in the National Vulnerability Database on September 14, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-36436 actively exploited?
CVE-2022-36436 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-36436?
CVE-2022-36436 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2022-36436?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-36436, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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