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Fencer Vulns
medium 5.4

CVE-2025-27809 json

Mbed TLS before 2.28.10 and 3.x before 3.6.3, on the client side, accepts servers that have trusted...

published 2025-03-25 19 mo ago modified 2026-07-23 3 mo ago also EUVD-2025-8055 , JLSEC-2025-227

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

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.

Patch / fix

  • julia MbedTLS_jll 2.28.10+0
  • Mbed mbedtls 2.28.10, 3.6.3
  • mbedtls Debian 14, Debian 13 3.6.3-1

debian advisories DEBIAN-CVE-2025-27809

  • mbedtls openSUSE Leap 16.0 3.6.6-bp160.1.1
  • mbedtls-2 openSUSE Leap 16.0 2.28.10-bp160.1.1
  • mbedtls-2 openSUSE Tumbleweed 2.28.10-1.1

opensuse advisories openSUSE-SU-2026:21144-1openSUSE-SU-2026:21145-1openSUSE-SU-2025:14928-1

  • mbedtls Alpine 3.19, Alpine 3.18 2.28.10-r0
  • mbedtls Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 3.6.3-r0
  • mbedtls2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 2.28.10-r0
  • mbedtls3 Alpine 3.24 3.6.3-r0

alpine advisories ALPINE-CVE-2025-27809

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
julia MbedTLS_jll
<2.28.10+0
2.28.10+0

Affected products

  • Mbed mbedtls

Classification

Weakness
  • CWE-1188 Initialization of a Resource with an Insecure Default

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.