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CVE-2020-13757

7.5 · HIGH

Python-RSA before 4.1 ignores leading '\0' bytes during decryption of ciphertext.

Published Jun 1, 2020CWE-327EPSS 1.43%

Overview

CVE-2020-13757 is a high-severity vulnerability. It was published on June 1, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Python-RSA before 4.1 ignores leading '\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python-RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/sybrenstuvel/python-rsa/issues/146GitHubgithub.com/sybrenstuvel/python-rsa/issues/146#issuecomment-641845667Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KILTHBHNSDUCYV22ODLOKTICJJ7JQIQ/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZYB65VNILRBTXL6EITQTH2PZPK7I23MW/Refusn.ubuntu.com/4478-1/GitHubgithub.com/sybrenstuvel/python-rsa/issues/146GitHubgithub.com/sybrenstuvel/python-rsa/issues/146#issuecomment-641845667Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KILTHBHNSDUCYV22ODLOKTICJJ7JQIQ/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZYB65VNILRBTXL6EITQTH2PZPK7I23MW/Refusn.ubuntu.com/4478-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-13757?

CVE-2020-13757 is a high-severity vulnerability. It was published on June 1, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2020-13757?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-13757?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-13757?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-13757 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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