---
cve: "CVE-2024-5642"
severity: "MEDIUM"
cvss: 6.5
epss: "74%"
vendor: "Python Software Foundation"
kev: false
exploited: false
published: "2024-06-27 21:15:16"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-09T03:51:01+02:00"
---

# CVE-2024-5642

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

CPython 3.9 and earlier doesn't disallow configuring an empty list ("[]") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Keine | good |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 91bdb00dfed8634de52e2f64cba7545deb20f74c (Commit)
- ba4217537c8a9f316921b8e3468bec86a9cab5f6 (Commit)

## Referenzen

- <https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html>
- <https://github.com/python/cpython/pull/23014>
- <https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/>
- <https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e>
- <http://www.openwall.com/lists/oss-security/2024/06/28/4>
- <https://github.com/python/cpython/issues/121227>
- <https://security.netapp.com/advisory/ntap-20240726-0005/>
- <https://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2024-5642) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_