How severe is CVE-2023-20867?

CVE-2023-20867 has a CVSS score of 3.9/10, rated LOW. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2023-20867?

Affected package information for CVE-2023-20867 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-20867?

No fixed version has been published for CVE-2023-20867 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2023-20867 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2023-20867, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-20867?

CVE-2023-20867 has an EPSS (Exploit Prediction Scoring System) score of 2.2%, placing it in the 85th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2023-20867 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2023-20867 (VMware Tools Authentication Bypass Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2023-06-23. CISA required all US federal civilian agencies to remediate this vulnerability by 2023-07-14. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

When was CVE-2023-20867 published, and has it been updated?

CVE-2023-20867 was published on June 13, 2023 and was last updated on April 16, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2023-06-23 — agencies required to remediate by 2023-07-14

CVE-2023-20867

LOW

Published

Jun 13, 2023

Updated

Apr 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

2.2%probability of exploitation in next 30 days

Lower Risk85th percentile-0.76%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

A fully compromised ESXi host can force VMware Tools to fail to authenticate host-to-guest operations, impacting the confidentiality and integrity of the guest virtual machine.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A fully compromised ESXi host can force VMware Tools to fail to authenti…

cisa.govCISAJun 2023

Frequently Asked Questions

A fully compromised ESXi host can force VMware Tools to fail to authenticate host-to-guest operations, impacting the confidentiality and integrity of the guest virtual machine.

O3 Security · Impact-Aware SCA

Is CVE-2023-20867 in your stack?

O3 detects CVE-2023-20867 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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