python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA…
Priority LOW 31CWE-385Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 5 fixed, 5 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.
Summary
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.
Why it matters now
EPSS 0.02463 84th percentileScored 2026-11-07
Fix Partial cryptography (PyPI): 3.2Red Hat: 3 advisoriesRed Hat: 5 fixed, 5 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | python-cryptography | python-cryptography 3.2 | — | No fix listed | CNA |
| — | cryptography (PyPI) | before 3.2 | 3.2 | Patch available | GHSA-hggm-jpg3-v476 |
- python-cryptography Vendor— Affected python-cryptography 3.2 Fixed in — No fix listed CNA
- cryptography (PyPI) Vendor— Affected before 3.2 Fixed in 3.2 Patch available GHSA-hggm-jpg3-v476
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cryptography.io:cryptography:3.2:*:*:*:*:python:*:* | 3.2 | Vulnerable | Cryptography.io |
| cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:* | 1.10.0 | Vulnerable | Oracle |
- cpe:2.3:a:cryptography.io:cryptography:3.2:*:*:*:*:python:*:* Versions 3.2 Vulnerable ·Cryptography.io
- cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:* Versions 1.10.0 Vulnerable ·Oracle
Remediation
- Fix · GHSA-hggm-jpg3-v476 cryptography (PyPI) Fixed in 3.2 Advisory →
Red Hat 3 advisories
- RHSA-2021:3254 Released 2021-08-24 · Red Hat rating Moderaterh-python38 security, bug fix, and enhancement update
- Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-python38-babel-2.7.0-12.el7, rh-python38-python-3.8.11-2.el7, rh-python38-python-babel-2.7.0-12.el7 +14
- Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-python38-babel-2.7.0-12.el7, rh-python38-python-3.8.11-2.el7, rh-python38-python-babel-2.7.0-12.el7 +14
- Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-python38-babel-2.7.0-12.el7, rh-python38-python-3.8.11-2.el7, rh-python38-python-babel-2.7.0-12.el7 +14
- RHSA-2021:2239 Released 2021-06-03 · Red Hat rating ModerateRed Hat Virtualization Host security update [ovirt-4.4.6]
- Red Hat Virtualization 4 Hypervisor for RHEL 8 redhat-virtualization-host-4.4.6-20210527.3.el8_4, redhat-virtualization-host-image-update-4.4.6-20210527.3.el8_4
- RHSA-2021:1608 Released 2021-05-18 · Red Hat rating Moderatepython-cryptography security, bug fix, and enhancement update
- Red Hat Enterprise Linux BaseOS (v. 8) python-cryptography-3.2.1-4.el8, python3-cryptography-3.2.1-4.el8
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ansible Automation Platform 1.2 | Affected | No fix planned: Will not fix |
| Red Hat Ansible Engine 2 | Affected | No fix planned: Out of support scope |
| Red Hat Ansible Tower 3 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2021:1608 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2021:3254 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) | Fixed | RHSA-2021:3254 |
| Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2021:3254 |
| Red Hat Virtualization 4 Hypervisor for RHEL 8 | Fixed | RHSA-2021:2239 |
Not affected: 5 products
- CloudForms Management Engine 5
- RHEL 8-based RHEV-H for RHEV 4 (build requirements)
- Red Hat Enterprise Linux 9
- Red Hat Virtualization 4 Hypervisor for RHEL 8
- Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts
Timeline
- 2026-10-02 Threatist record created from CVE-2020-25659
- 2026-10-03 Alias added: GHSA-hggm-jpg3-v476
References
Patch 3
Advisory 2
Other 6
- https://github.com/pyca/cryptography/security/advisories/GHSA-hggm-jpg3-v476
- https://github.com/pyca/cryptography/pull/5507
- https://github.com/pyca/cryptography/commit/58494b41d6ecb0f56b7c5f05d5f5e3ca0320d494
- https://github.com/pyca/cryptography
- https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-62.yaml
- https://pypi.org/project/cryptography
Sources
- CVE-2020-25659 · CVE Program
- CVE-2020-25659 · NVD
- FIRST EPSS
- GHSA-hggm-jpg3-v476 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-25659 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences