CVE-2020-36242
CRITICALCVSS 9.1/10EPSS 6.72%
Last modified
CVE-2020-36242 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.. EPSS estimates a 6.72% chance of exploitation in the next 30 days.
Description
In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cryptography.Io | Cryptography | < 3.3.2 |
| Fedoraproject | Fedora | 33 |
| Oracle | Communications Cloud Native Core Network Function Cloud Native Environment | 1.10.0 |
References
- https://github.com/pyca/cryptography/blob/master/CHANGELOG.rstRelease Notes, Third Party Advisory
- https://github.com/pyca/cryptography/compare/3.3.1...3.3.2Patch, Third Party Advisory
- https://github.com/pyca/cryptography/issues/5615Exploit, Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://github.com/pyca/cryptography/blob/master/CHANGELOG.rstRelease Notes, Third Party Advisory
- https://github.com/pyca/cryptography/compare/3.3.1...3.3.2Patch, Third Party Advisory
- https://github.com/pyca/cryptography/issues/5615Exploit, Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-36242?
In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
How severe is CVE-2020-36242?
CVE-2020-36242 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 6.72% probability of exploitation in the next 30 days.
How do I fix CVE-2020-36242?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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