CVE-2025-9231

Issue summary: A timing side-channel which could potentially allow remote recovery of the private key exists in the SM2 algorithm implementation on 64 bit ARM platforms. Impact summary: A timing side-channel in SM2 signature computations on 64 bit ARM platforms could allow recovering the private key by an attacker.. While remote key recovery over a network was not attempted by the reporter, timing measurements revealed a timing signal which may allow such an attack. OpenSSL does not directly support certificates with SM2 keys in TLS, and so this CVE is not relevant in most TLS contexts. However, given that it is possible to add support for such certificates via a custom provider, coupled with the fact that in such a custom provider context the private key may be recoverable via remote timing measurements, we consider this to be a Moderate severity issue. The FIPS modules in 3.5, 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected by this issue, as SM2 is not an approved algorithm.

Scoring

CVSS base score

1.11

CVSS vector

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

EPSS probability

2.24%

CWE

CWE-385

Published

2025-09-30

Last modified

2026-07-14

Affected products

• OpenSSL OpenSSL
• OpenSSL OpenSSL
• OpenSSL OpenSSL
• OpenSSL OpenSSL

Weakness type

• CWE-385

Related vulnerabilities

• CVE-2026-84308 — phpseclib — non-constant-time X25519 scalar multiplication permits full private-key recovery
• CVE-2026-55785 — free5GC AUSF uses non-constant-time authentication comparisons and logs XRES* in 5G-AKA
• CVE-2026-6478 — PostgreSQL discloses MD5-hashed passwords via covert timing channel
• CVE-2026-5598 — Non-constant time comparisons risk private key leakage in FrodoKEM.
• CVE-2025-59425 — vLLM vulnerable to timing attack at bearer auth
• CVE-2025-59432 — Timing Attack Vulnerability in SCRAM Authentication
• CVE-2025-49087 — In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal...
• CVE-2025-53826 — FileBrowser Has Insecure JWT Handling Which Allows Session Replay Attacks after Logout

Markdown version · Browse all CVEs