---
cve: "CVE-2025-49812"
severity: "HIGH"
cvss: 7.4
epss: "54%"
vendor: "Apache Software Foundation"
kev: false
exploited: false
published: "2025-07-10 17:15:48"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T01:50:10+02:00"
---

# CVE-2025-49812

> 7.4 HIGH

## Beschreibung

In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade.

Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommended to upgrade to version 2.4.64, which removes support for TLS upgrade.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 7e926454793abd7d71b6afc8bd1ec1648752c6ad (Commit)

## Referenzen

- <https://httpd.apache.org/security/vulnerabilities_24.html>
- <http://www.openwall.com/lists/oss-security/2025/07/09/3>
- <http://www.openwall.com/lists/oss-security/2025/07/10/2>
- <http://www.openwall.com/lists/oss-security/2025/07/10/9>
- <https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-49812) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_