CVE-2025-27809

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Summary

CVECVE-2025-27809
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-03-25 06:15:41 UTC
Updated2026-06-05 19:38:32 UTC
DescriptionMbed 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.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

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

EPSS: 0.001400000 probability, percentile 0.339560000 (date 2026-06-11)

Problem Types: CWE-1188 | CWE-1188 CWE-1188 Initialization of a Resource with an Insecure Default

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Arm Mbed Tls All All All All
Application Trustedfirmware Mbed Tls All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mbed Mbedtls affected 2.28.10 semver Not specified
CNA Mbed Mbedtls affected 3.0.0 3.6.3 semver Not specified

References

ReferenceSourceLinkTags
github.com/Mbed-TLS/mbedtls/issues/466 af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking
mastodon.social/@bagder/114219540623402700 af854a3a-2127-422b-91ae-364da2661108 mastodon.social Not Applicable
github.com/Mbed-TLS/mbedtls/releases [email protected] github.com Release Notes
mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-... [email protected] mbed-tls.readthedocs.io Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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