Vulnerability · Published Aug 29, 2025 · Assigned by NCSC.ch
CVE-2025-9071Insecure RSA-OAEP implementation with all-zero seed for padding in Oberon PSA Crypto
Low 2.3
In plain English
A low-severity security flaw in Oberon PSA Crypto from Oberon microsystems AG. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Oberon microsystems AG | Oberon PSA Crypto | 1.0.0 – through 1.5.1 |
Weakness: CWE-780 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/S:N/RE:L