CVE-2020-25659

5.9 mediumEPSS 2.5%

Medium (5.9). EPSS 2.5% chance of exploitation in the next 30 days. Fixed in cryptography 3.2, 3.2.1.

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.

Severity

CVSS 3.1

5.9 medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 2.5% chance of exploitation in the next 30 days; higher than 84% of CVEs (scores of 2026-10-31)
CWE: CWE-385
Published: 2021-01-11
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

cryptography.io:cryptography
oracle:communications_cloud_native_core_network_function_cloud_native_environment

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-hggm-jpg3-v476	PyPI	cryptography	<3.2	3.2
PYSEC-2021-62	PyPI	cryptography	<3.2.1	3.2.1

References

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

Check your stack JSON