---
id: CVE-2023-38200
aliases:
  - GHSA-pg75-v6fp-8q59
  - PYSEC-2026-1489
title: >-
  Keylime's registrar vulnerable to Denial-of-service attack via a single open
  connection
summary: >-
  Keylime's registrar vulnerable to Denial-of-service attack via a single open
  connection
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: keylime
product: keylime
ecosystem: pip
affected:
  - keylime < 7.4.0
patched:
  - keylime 7.4.0
published: '2023-08-01'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-pg75-v6fp-8q59'
references:
  - url: 'https://github.com/keylime/keylime/security/advisories/GHSA-pg75-v6fp-8q59'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-38200'
  - url: 'https://github.com/keylime/keylime/pull/1421'
  - url: >-
      https://github.com/keylime/keylime/commit/c68d8f0b7ea549c12b6956ab0f3c28ae0360ae17
  - url: 'https://access.redhat.com/security/cve/CVE-2023-38200'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2222692'
  - url: 'https://github.com/keylime/keylime'
  - url: 'https://github.com/keylime/keylime/releases/tag/v7.4.0'
tags:
  - osv
  - pip
epss: 0.01448
epssPercentile: 0.72182
ingestedAt: '2026-07-08T18:25:51.759Z'
---

## Overview

### Impact
Keylime `registrar` is prone to a simple denial of service attack in which an adversary opens a connection to the TLS port (by default, port `8891`) blocking further, legitimate connections. As long as the connection is open, the `registrar` is blocked and cannot serve any further clients (`agents` and `tenants`), which prevents normal operation. The problem does not affect the `verifier`.

### Patches
Users should upgrade to release 7.4.0

## Affected packages

- `keylime < 7.4.0`

## Remediation

Upgrade to a patched release:

- `keylime 7.4.0`