CVE-2025-9071
LowCVSS 2.3Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
Oberon microsystems AG's Oberon PSA Crypto library (all versions up to 1.5.1) erroneously used an all-zero seed for RSA-OAEP padding instead of generated random bytes. This results in deterministic RSA, leading to loss of confidentiality for guessable messages, recognition of repeated messages, and loss of security proofs.
Risk Assessment
RSA encryption becomes deterministic, allowing an attacker to recognize repeated messages and guess content, thereby breaching data confidentiality.
Recommendation
Update the Oberon PSA Crypto library to a version later than 1.5.1 if available, or apply compensating controls; contact the vendor for a fix.
Other vulnerabilities in Oberon PSA Crypto
See all- CVE-2026-16459Medium
Padding oracle attack vulnerability in Oberon microsystem AG’s Oberon PSA Crypto library in all versions since 1.0.0 and prior to 2.1.1 allows an attacker to recover plaintexts via timing measurements of RSA PKCS#1 v1.5 decrypt operations.
- CVE-2025-7383Medium
Oberon PSA Crypto library versions 1.0.0 through before 1.5.1 are vulnerable to a padding oracle attack. An attacker can recover plaintexts via timing measurements of AES-CBC PKCS#7 decrypt operations.
Original NVD description (English source)
Erroneously using an all-zero seed for RSA-OEAP padding instead of the generated random bytes, in Oberon microsystems AG’s Oberon PSA Crypto library in all versions up to 1.5.1, results in deterministic RSA and thus in a loss of confidentiality for guessable messages, recognition of repeated messages, and loss of security proofs.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS