CVE-2020-36242

9.1 CRITICAL 7% exploit odds Fix listed Memory safety Library

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, service disruption.
Exploit odds: 6.8% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-02-07 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:15 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 6.8% in the next 30 days (EPSS).
Severity: 9.1 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-02-07 20:15 UTC
Last modified: 2026-06-17 03:15 UTC
Exploit probability: 6.8% · EPSS, next 30 days
Weakness: CWE-190 · Integer overflow
Record status: Modified

Affected

cryptography.io Cryptography < 3.3.2
Fedoraproject Fedora 33
Oracle Communications Cloud Native Core Network Function Cloud Native Environment 1.10.0

Attack profile CVSS 3.1 · 9.1

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-36242.md and follow it. Check whether this project is affected by CVE-2020-36242. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record