Insecure RSA-OAEP implementation with all-zero seed for padding in Oberon PSA Crypto
Priority LOW 11CWE-780Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00175 7th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Oberon microsystems AG | Oberon PSA Crypto | 1.0.0 – 1.5.1 | — | No fix listed | CNA |
- Oberon PSA Crypto VendorOberon microsystems AG Affected 1.0.0 – 1.5.1 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-9071
- 2026-10-03 Alias added: GHSA-5h27-5x9j-ffpx
References
More Oberon microsystems AG vulnerabilities
- TI-2026-13753 Timing side-channel in RSA PKCS#1 v1.5 decryption in Oberon PSA Crypto CVSS 4.0MEDIUM 5.9
- TI-2026-13752 Timing side-channel in RSA PKCS#1 v1.5 decryption in ocrypto CVSS 4.0MEDIUM 5.9
- TI-2025-06725 Timing side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in Oberon PSA Crypto library CVSS 4.0MEDIUM 5.9
- TI-2025-06433 Timing side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in ocrypto library CVSS 4.0MEDIUM 5.9
Sources
- CVE-2025-9071 · CVE Program
- CVE-2025-9071 · NVD
- FIRST EPSS
- GHSA-5h27-5x9j-ffpx · GitHub Advisory Database · CC BY 4.0
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