5.4

CVE-2025-27809: arm mbed_tls

CVSS: 5.4v3.1MediumAnalyzed
AliasesALPINE-CVE-2025-27809UBUNTU-CVE-2025-27809DEBIAN-CVE-2025-27809
Published 25-03-2025Last modified 25-03-2025
Open JSON

Vulnerability summary

CVE-2025-27809 is a medium (CVSS 5.4) vulnerability in arm mbed_tls. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.4% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.20%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
OPENSUSE-SU-2025:14928-1OPENSUSE-SU-2026:21144-1OPENSUSE-SU-2026:21145-1

Timeline

  1. 25-03-2025
    PublishedVulnerability first disclosed.
  2. 25-03-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

+0.01 pp

From 0.19% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Alpine1 product
  • mbedtls< 2.28.10-r0 | < 3.6.3-r0
Arm1 product
Debian1 product
  • mbedtlsAll versions (No fix recorded) | < 3.6.3-1
Mbed1 product
  • mbedtls< 2.28.10 | ≥ 3.0.0, < 3.6.3
Trustedfirmware1 product
Ubuntu1 product
  • mbedtlsAll versions (No fix recorded)

6 vendors · 6 products

References

8 links