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CVE-2020-25659 cryptography

Affected softwarecryptography
Severity5.9 Medium CVSS 3.1 2 scores
WeaknessCWE-385
Published11 Jan 2021
Updated17 Jun 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 5 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 2.5% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

5.9 MEDIUM v3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
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 NVD Primary published
CVSS 2.0 4.3 none AV:N/AC:M/Au:N/C:P/I:N/A:N NVD Primary

Affected software and releases

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
nvd cryptography.io cryptography generic 3.2
nvd oracle communications cloud native core network function cloud native environment generic 1.10.0

References

URLTags
https://github.com/pyca/cryptography/pull/5507/commits/ce1bef6f1ee06ac497ca0c837fbd1c7ef6c2472b Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html Patch, Third Party Advisory

Timeline

Published2021-01-11By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.