CVE-2020-25659

MEDIUM EPSS 82.4%
Published Jan 11, 20215y ago · Modified Jun 17, 20262w ago
5.9 CVSS 3.1
Medium
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Published Jan 11, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

Description

python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed processing of valid PKCS#1 v1.5 ciphertext.

CVSS Details

Base Score
5.9
Exploitability
2.2
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
82.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-385

Affected Products 2

VendorProductVersionRange
cryptography.iocryptography3.2any
oraclecommunications_cloud_native_core_network_function_cloud_native_environment1.10.0any

References 3

  • github.com https://github.com/pyca/cryptography/pull/5507/commits/ce1bef6f1ee06ac497ca0c837fbd1c7ef6c2472b
    PatchThird Party Advisory
  • oracle.com https://www.oracle.com/security-alerts/cpuapr2022.html
    PatchThird Party Advisory
  • oracle.com https://www.oracle.com/security-alerts/cpujul2022.html
    PatchThird Party Advisory

Remediation

  • github.com https://github.com/pyca/cryptography/pull/5507/commits/ce1bef6f1ee06ac497ca0c837fbd1c7ef6c2472b
    PatchThird Party Advisory
  • oracle.com https://www.oracle.com/security-alerts/cpuapr2022.html
    PatchThird Party Advisory
  • oracle.com https://www.oracle.com/security-alerts/cpujul2022.html
    PatchThird Party Advisory