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🛡️ CVE-2025-9231

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-385 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: None.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2025-9231 is classified as CWE-385: Covert Timing Channel. Covert timing channels convey information by modulating some aspect of system behavior over time, so that the program receiving the information can observe system behavior and infer protected information.

Affected software

CVE-2025-9231 is recorded against 1 package.

  • unknown

Timeline and source

Published on 30 September 2025 and last revised on 14 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com
github.com
github.com
openssl-library.org
www.openwall.com
www.openwall.com
cert-portal.siemens.com
cert-portal.siemens.com
cert-portal.siemens.com
cert-portal.siemens.com

Other advisories for this package

unknown has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-385: Covert Timing Channel) in other software:

CVE-2025-9231 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CWE CWE-385
Public Exploit ✅ No
Source NVD
Published 2025-09-30
Updated 2026-08-20
Modified 2026-07-14
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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