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Vulnerability details: VCID-ktmz-35r6-u3bw
Vulnerability ID VCID-ktmz-35r6-u3bw
Aliases CVE-2025-27809
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 4.9
Risk 2.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-1188 Initialization of a Resource with an Insecure Default
System Score Found at
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2025-27809
cvssv3.1 5.4 https://github.com/Mbed-TLS/mbedtls/releases
ssvc Track https://github.com/Mbed-TLS/mbedtls/releases
cvssv3.1 5.4 https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/
ssvc Track https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2025-27809
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-27809
https://github.com/Mbed-TLS/mbedtls/issues/466
https://mastodon.social/@bagder/114219540623402700
1101499 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1101499
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
CVE-2025-27809 https://nvd.nist.gov/vuln/detail/CVE-2025-27809
mbedtls-security-advisory-2025-03-1 https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/
releases https://github.com/Mbed-TLS/mbedtls/releases
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N Found at https://github.com/Mbed-TLS/mbedtls/releases
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-25T14:41:49Z/ Found at https://github.com/Mbed-TLS/mbedtls/releases
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N Found at https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-25T14:41:49Z/ Found at https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/
Exploit Prediction Scoring System (EPSS)
Percentile 0.0851
EPSS Score 0.00035
Published At Sept. 9, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:30:56.856555+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/edge/main.json 37.0.0