Plaintext disclosure via zero-seeded RSA-OAEP padding
Published Aug 29, 2025 · Updated Aug 29, 2025
Cryptographic weakness in Oberon PSA Crypto 1.0.0 through 1.5.1 allows attackers to recover guessable plaintexts from RSA-OAEP ciphertexts. The padding algorithm discards its generated random seed and supplies all-zero bytes instead, causing identical plaintexts to produce identical ciphertexts. Exploitation requires access to ciphertexts for guessable messages; random key-exchange values are not affected.
Summary
What happened
Cryptographic weakness in Oberon PSA Crypto 1.0.0 through 1.5.1 allows attackers to recover guessable plaintexts from RSA-OAEP ciphertexts. The padding algorithm discards its generated random seed and supplies all-zero bytes instead, causing identical plaintexts to produce identical ciphertexts. Exploitation requires access to ciphertexts for guessable messages; random key-exchange values are not affected.
The record
- CVE
- CVE-2025-9071
- Published
- Aug 29, 2025
- Updated
- Aug 29, 2025
- Vendor
- Oberon microsystems AG
- Product
- Oberon PSA Crypto
- Classifications
- CWE-780
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 29, 2025CVE publishedPublication date reported by the CVE source.
- Aug 29, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.0 <=1.5.1 changes=[{"at":"rsa_oaep_padding.patch","status":"unaffected"}]
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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