CVE-2025-7071— Timing side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in ocrypto library
Quick assessment
Affected
Oberon microsystems AG ocrypto
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Oberon microsystem AG ocrypto library是瑞士Oberon公司的一个加密软件库。 Oberon microsystem AG ocrypto library 3.1.0至3.9.2之前版本存在安全漏洞，该漏洞源于AES-CBC PKCS#7解密操作存在填充预言攻击。
Possible ATT&CK Techniques 1 AI
T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2025-7071
Vulnerability Information
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Vulnerability Title
Timing side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in ocrypto library
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Oberon microsystem AG ocrypto library 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Oberon microsystem AG ocrypto library是瑞士Oberon公司的一个加密软件库。 Oberon microsystem AG ocrypto library 3.1.0至3.9.2之前版本存在安全漏洞，该漏洞源于AES-CBC PKCS#7解密操作存在填充预言攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Oberon microsystems AG | ocrypto | 3.1.0 ~ 3.9.1 | - |
|
II. Public POCs for CVE-2025-7071
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-7071 (1)
Same Patch Batch · Oberon microsystems AG · 2025-08-29 · 3 CVEs total
| CVE-2025-7383 | Timing side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in Oberon PSA | |
| CVE-2025-9071 | Insecure RSA-OAEP implementation with all-zero seed for padding in Oberon PSA Crypto |
IV. Related Vulnerabilities
Same vendor: Oberon microsystems AG
-
CVE-2026-16458
Timing side-channel in RSA PKCS#1 v1.5 decryption in ocrypto -
CVE-2026-16459
Timing side-channel in RSA PKCS#1 v1.5 decryption in Oberon -
CVE-2025-9071
Insecure RSA-OAEP implementation with all-zero seed for padd -
CVE-2025-7383
Timing side-channel vulnerability in AES-CBC decryption with
Same weakness: CWE-208
-
CVE-2026-107269
Gophish through 0.12.1 Username Enumeration via POST /login -
CVE-2026-18040
HQC leaks private key information through secret-indexed GF( -
CVE-2026-18036
NTRU leaks private key information by reducing secret values -
CVE-2026-77696
Timing Side-Channel in SM2 Signature Generation -
CVE-2026-54875
Non-Constant-Time SM2 Scalar Multiplication on ARM64 and RIS
V. Comments for CVE-2025-7071
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