TI-2025-34525 Aliases CVE-2025-54764 GHSA-6237-9hpw-gcm6

Mbed TLS before 3.6.5 allows a local timing attack against certain RSA operations, and…

LOW 27CWE-208Published 2025-10-20 · Updated 2025-10-21

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-208.

Summary

Mbed TLS before 3.6.5 allows a local timing attack against certain RSA operations, and direct calls to mbedtls_mpi_mod_inv or mbedtls_mpi_gcd.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00221 12th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

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

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:arm:mbed_tls::::::::	before 3.6.5	Vulnerable	Arm

cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* Versions before 3.6.5 Vulnerable ·Arm

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2025-54764
2026-10-03 Alias added: GHSA-6237-9hpw-gcm6

References

Exploit 1

https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-10-ssbleed-mstep/

Advisory 1

https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/

TI-2023-28736 An issue was discovered in Mbed TLS through 3.5.1. CVSS 3.1HIGH 7.5
TI-2021-19505 A Denial of Service vulnerability exists in mbed TLS 3.0.0 and earlier in the… CVSS 3.1HIGH 7.5
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-2022-22925 An issue was discovered in Mbed TLS before 2.28.2 and 3.x before 3.3.0. CVSS 3.1CRITICAL 9.8
TI-2018-00445 Out-of-bounds write in ARM mbed TLS before 1.3.22, before 2.1.10, and before 2.7.0 CVSS 3.0CRITICAL 9.8
TI-2026-27113 An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. CVSS 3.1CRITICAL 9.8

See all 50 →

Sources

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