Timing side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in ocrypto library
Priority LOW 25CWE-208Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-208.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0009 0th 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 | ocrypto | 3.1.0 – 3.9.1 | — | No fix listed | CNA |
- ocrypto VendorOberon microsystems AG Affected 3.1.0 – 3.9.1 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-7071
- 2026-10-03 Alias added: GHSA-fw6m-5fq2-8fqr
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-2025-08313 Insecure RSA-OAEP implementation with all-zero seed for padding in Oberon PSA Crypto CVSS 4.0LOW 2.3
Sources
- CVE-2025-7071 · CVE Program
- CVE-2025-7071 · NVD
- FIRST EPSS
- GHSA-fw6m-5fq2-8fqr · GitHub Advisory Database · CC BY 4.0
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