---
cve: "CVE-2025-22870"
severity: "MEDIUM"
cvss: 4.4
epss: "40%"
vendor: "Go standard library"
kev: false
exploited: false
published: "2025-03-12 18:27:59"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T08:27:43+02:00"
---

# CVE-2025-22870

> 4.4 MEDIUM

## Beschreibung

Matching of hosts against proxy patterns can improperly treat an IPv6 zone ID as a hostname component. For example, when the NO_PROXY environment variable is set to "*.example.com", a request to "[::1%25.example.com]:80` will incorrectly match and not be proxied.

## CVSS-Vektor

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

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

## Referenzen

- <https://go.dev/cl/654697>
- <https://go.dev/issue/71984>
- <https://groups.google.com/g/golang-announce/c/4t3lzH3I0eI/m/b42ImqrBAQAJ>
- <https://pkg.go.dev/vuln/GO-2025-3503>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-22870) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_