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TI-2025-20583 Aliases CVE-2025-27809GHSA-76fv-m4gp-q47j

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

Priority LOW 24CWE-1188Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00201 10th percentileScored 2026-11-07
Fix Fixed mbedtls (Mbed): 2.28.10, 3.6.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Mbedmbedtlsbefore 2.28.10; 3.0.0 to before 3.6.32.28.10, 3.6.3Patch availableCNA
  • mbedtls VendorMbed Affected before 2.28.10; 3.0.0 to before 3.6.3 Fixed in 2.28.10, 3.6.3 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*before 2.28.10VulnerableArm
cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*3.0.0 to before 3.6.3VulnerableOP-TEE
  • cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* Versions before 2.28.10 Vulnerable ·Arm
  • cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:* Versions 3.0.0 to before 3.6.3 Vulnerable ·OP-TEE

Remediation

  • Fix · CNA mbedtls (Mbed) Fixed in 2.28.10, 3.6.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mbed mbedtls 2.28.10, 3.6.3

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2025-20584 Use of uninitialized resource in mbedtlsPriority LOW 24
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-27809
  2. 2026-10-03 Alias added: GHSA-76fv-m4gp-q47j

References

Advisory 1

Other 1

  • TI-2025-32620 Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler… CVSS 3.1HIGH 7.8
  • TI-2025-30320 Use after free in mbedtls CVSS 3.1CRITICAL 9.8
  • TI-2019-12830 Buffer overflows were discovered in the CoAP library in Arm Mbed OS 5.14.0. CVSS 3.1CRITICAL 9.8
  • TI-2019-12829 An integer overflow was discovered in the CoAP library in Arm Mbed OS 5.14.0. CVSS 3.1CRITICAL 9.8
  • TI-2025-31103 NULL pointer dereference in mbedtls CVSS 3.1HIGH 7.5
  • TI-2025-31614 Out-of-bounds read in mbedtls CVSS 3.1MEDIUM 6.5
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences