Vulnerability · Published Mar 25, 2025 · Assigned by mitre
CVE-2025-27809
Medium 5.4
In plain English
A medium-severity security flaw in mbedtls from Mbed. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 89.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mbed TLS before 2.28.10 and 3.x before 3.6.3, on the client side, accepts servers that have trusted certificates for arbitrary hostnames unless the TLS client application calls mbedtls_ssl_set_hostname.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | mbedtls | 3.6.3-r0 | ALPINE-CVE-2025-27809 |
| Alpine:v3.21 | mbedtls | 3.6.3-r0 | ALPINE-CVE-2025-27809 |
| Alpine:v3.22 | mbedtls | 3.6.3-r0 | ALPINE-CVE-2025-27809 |
| Alpine:v3.23 | mbedtls | 3.6.3-r0 | ALPINE-CVE-2025-27809 |
| Alpine:v3.24 | mbedtls | 3.6.3-r0 | ALPINE-CVE-2025-27809 |
| Alpine:v3.21 | mbedtls2 | 2.28.10-r0 | ALPINE-CVE-2025-27809 |
| Alpine:v3.22 | mbedtls2 | 2.28.10-r0 | ALPINE-CVE-2025-27809 |
| Alpine:v3.23 | mbedtls2 | 2.28.10-r0 | ALPINE-CVE-2025-27809 |
| Alpine:v3.24 | mbedtls2 | 2.28.10-r0 | ALPINE-CVE-2025-27809 |
| Alpine:v3.24 | mbedtls3 | 3.6.3-r0 | ALPINE-CVE-2025-27809 |
| Debian:12 | mbedtls | no fix listed | DEBIAN-CVE-2025-27809 |
| Debian:13 | mbedtls | 3.6.3-1 | DEBIAN-CVE-2025-27809 |
| Debian:14 | mbedtls | 3.6.3-1 | DEBIAN-CVE-2025-27809 |
| Ubuntu:22.04:LTS | mbedtls | no fix listed | UBUNTU-CVE-2025-27809 |
| Ubuntu:24.04:LTS | mbedtls | no fix listed | UBUNTU-CVE-2025-27809 |
| Ubuntu:25.10 | mbedtls | no fix listed | UBUNTU-CVE-2025-27809 |
Affected products (as reported)
Weakness: CWE-1188 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N