CVE-2025-7071

Timing side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in ocrypto library

State: Published
Severity: 5.9 Medium
Published: Aug 29, 2025
Updated: Aug 29, 2025
Reserved: Jul 4, 2025

Description

Padding oracle attack vulnerability in Oberon microsystem AG’s ocrypto library in all versions since 3.1.0 and prior to 3.9.2 allows an attacker to recover plaintexts via timing measurements of AES-CBC PKCS#7 decrypt operations.

Scores

CVSS	Score	Vector	Source
4.0	5.9 Medium	CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	NCSC.ch

Weaknesses

CWE-208 Observable Timing Discrepancy
CWE-327 Use of a Broken or Risky Cryptographic Algorithm

Affected Products

Product	Versions
ocryptoOberon microsystems AG	3.1.0 through 3.9.1Affected

References

https://www.oberon.ch/security-advisories/cve-2025-7071/

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