CVE-2020-25659: RSA decryption vulnerable to Bleichenbacher timing vulnerability

CVE-2020-25659 · Severity: low · CVSS 3.1 · Published 2021-01-11

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.

Technologies: cryptography (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2020-25659 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2020-25659 being exploited in the wild.
How severe is CVE-2020-25659?
Low severity, with a CVSS score of 3.1, published 11 January 2021.
Which products and versions are affected?
cryptography (PyPI) ECOSYSTEM:introduced=0,fixed=3.2, ECOSYSTEM:introduced=0,fixed=3.2.1.
Is there a fix for CVE-2020-25659?
Yes. cryptography (PyPI): upgrade to 3.2, 3.2.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2020-25659?
Check whether you run cryptography (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • cryptography (PyPI): upgrade to 3.2, 3.2.1 or later
    pip install "cryptography>=3.2.1"

Affected products

  • cryptography (PyPI) ECOSYSTEM:introduced=0,fixed=3.2, ECOSYSTEM:introduced=0,fixed=3.2.1

Identifiers

  • CVE-2020-25659
  • GHSA-hggm-jpg3-v476
  • PYSEC-2021-62

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