Broken or risky cryptographic algorithm in Sybren A. Stüvel python-rsa
Priority LOW 36CWE-385Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 3 fixed, 4 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-327.
Summary
It was found that python-rsa is vulnerable to Bleichenbacher timing attacks. An attacker can use this flaw via the RSA decryption API to decrypt parts of the cipher text encrypted with RSA.
Why it matters now
EPSS 0.01651 76th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial rsa (PyPI): 4.7Red Hat: 3 advisoriesRed Hat: 3 fixed, 4 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 |
|---|---|---|---|---|---|
| Sybren A. Stüvel | python-rsa | after 3.0 (inclusive) | — | No fix listed | CNA |
| — | rsa (PyPI) | 2.1 to before 4.7 | 4.7 | Patch available | GHSA-xrx6-fmxq-rjj2 |
- python-rsa VendorSybren A. Stüvel Affected after 3.0 (inclusive) Fixed in — No fix listed CNA
- rsa (PyPI) Vendor— Affected 2.1 to before 4.7 Fixed in 4.7 Patch available GHSA-xrx6-fmxq-rjj2
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:python-rsa_project:python-rsa:*:*:*:*:*:*:*:* | 2.1 to before 4.7 | Vulnerable | Python-rsa Project |
| cpe:2.3:a:redhat:openstack_platform:13.0:*:*:*:*:*:*:* | 13.0 | Vulnerable | Red Hat |
| cpe:2.3:a:redhat:openstack_platform:16.0:*:*:*:*:*:*:* | 16.0 | Vulnerable | Red Hat |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | 35 | Vulnerable | Fedoraproject |
- cpe:2.3:a:python-rsa_project:python-rsa:*:*:*:*:*:*:*:* Versions 2.1 to before 4.7 Vulnerable ·Python-rsa Project
- cpe:2.3:a:redhat:openstack_platform:13.0:*:*:*:*:*:*:* Versions 13.0 Vulnerable ·Red Hat
- cpe:2.3:a:redhat:openstack_platform:16.0:*:*:*:*:*:*:* Versions 16.0 Vulnerable ·Red Hat
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
Remediation
- Fix · GHSA-xrx6-fmxq-rjj2 rsa (PyPI) Fixed in 4.7 Advisory →
Red Hat 3 advisories
- RHSA-2022:1716 Released 2022-05-05 · Red Hat rating ModerateRed Hat Ceph Storage 4.3 Security and Bug Fix update
- Red Hat Ceph Storage 4.3 MON ceph-2:14.2.22-110.el7cp, ceph-2:14.2.22-110.el8cp, ceph-base-2:14.2.22-110.el7cp +47
- Red Hat Ceph Storage 4.3 OSD ceph-2:14.2.22-110.el7cp, ceph-2:14.2.22-110.el8cp, ceph-base-2:14.2.22-110.el7cp +39
- Red Hat Ceph Storage 4.3 Tools ceph-2:14.2.22-110.el7cp, ceph-2:14.2.22-110.el8cp, ceph-base-2:14.2.22-110.el7cp +47
- RHSA-2021:0637 Released 2021-03-03 · Red Hat rating ImportantOpenShift Container Platform 3.11.394 bug fix and security update
- Red Hat OpenShift Container Platform 3.11 jenkins-2-plugins-3.11.1612862361-1.el7, jenkins-2.263.3.1612433584-1.el7, python-rsa-4.5-3.el7 +1
- RHSA-2020:5634 Released 2021-02-24 · Red Hat rating ModerateOpenShift Container Platform 4.7.0 packages security update
- Red Hat OpenShift Container Platform 4.7 cri-o-1.20.0-0.rhaos4.7.git8921e00.el7.51, cri-o-1.20.0-0.rhaos4.7.git8921e00.el8.51, cri-tools-1.18.0-3.el7 +9
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 16 (Train) | Affected | No fix planned: Will not fix |
| Red Hat Quay 3 | Affected | No fix planned: Will not fix |
| Red Hat Ceph Storage 4.3 MON | Fixed | RHSA-2022:1716 |
| Red Hat OpenShift Container Platform 3.11 | Fixed | RHSA-2021:0637 |
| Red Hat OpenShift Container Platform 4.7 | Fixed | RHSA-2020:5634 |
Not affected: 5 products
- Red Hat Ceph Storage 4.3 MON
- Red Hat Ceph Storage 4.3 OSD
- Red Hat Ceph Storage 4.3 Tools
- Red Hat OpenShift Container Platform 3.11
- Red Hat OpenShift Container Platform 4.7
Timeline
- 2026-10-02 Threatist record created from CVE-2020-25658
- 2026-10-03 Alias added: GHSA-xrx6-fmxq-rjj2
References
Advisory 6
Other 14
- https://github.com/sybrenstuvel/python-rsa/commit/dae8ce0d85478e16f2368b2341632775313d41ed
- https://access.redhat.com/security/cve/CVE-2020-25658
- https://bugzilla.redhat.com/show_bug.cgi?id=1889972
- https://github.com/pypa/advisory-database/tree/main/vulns/rsa/PYSEC-2020-100.yaml
- https://github.com/sybrenstuvel/python-rsa
- https://access.redhat.com/errata/RHSA-2022:1716
- https://access.redhat.com/errata/RHSA-2021:0637
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SAF67KDGSOHLVFTRDOHNEAFDRSSYIWA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APF364QJ2IYLPDNVFBOEJ24QP2WLVLJP
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QY4PJWTYSOV7ZEYZVMYIF6XRU73CY6O7
- https://lists.fedoraproject.org/archives/list/[email protected]/message/2SAF67KDGSOHLVFTRDOHNEAFDRSSYIWA
- https://lists.fedoraproject.org/archives/list/[email protected]/message/APF364QJ2IYLPDNVFBOEJ24QP2WLVLJP
- https://lists.fedoraproject.org/archives/list/[email protected]/message/QY4PJWTYSOV7ZEYZVMYIF6XRU73CY6O7
- https://access.redhat.com/errata/RHSA-2020:5634
Sources
- CVE-2020-25658 · CVE Program
- CVE-2020-25658 · NVD
- FIRST EPSS
- GHSA-xrx6-fmxq-rjj2 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-25658 · Red Hat security data · CC BY 4.0
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