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CVE-2021-39195

7.7 · HIGH

Misskey is an open source, decentralized microblogging platform.

Published Sep 7, 2021CWE-918EPSS 1.06%

Overview

CVE-2021-39195 is a high-severity vulnerability. It was published on September 7, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Misskey is an open source, decentralized microblogging platform. In affected versions a Server-Side Request Forgery vulnerability exists in "Upload from URL" and remote attachment handling. This could result in the disclosure of non-public information within the internal network. This has been fixed in 12.90.0. However, if you are using a proxy, you will need to take additional measures. As a workaround this exploit may be avoided by appropriately restricting access to private networks from the host where the application is running.

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/misskey-dev/misskey/blob/develop/CHANGELOG.md#12900-20210904GitHubgithub.com/misskey-dev/misskey/commit/e1a8b158e04ad567d92d8daf3cc0898ee18f1a2eGitHubgithub.com/misskey-dev/misskey/security/advisories/GHSA-mqv7-gxh4-r5vfGitHubgithub.com/misskey-dev/misskey/blob/develop/CHANGELOG.md#12900-20210904GitHubgithub.com/misskey-dev/misskey/commit/e1a8b158e04ad567d92d8daf3cc0898ee18f1a2eGitHubgithub.com/misskey-dev/misskey/security/advisories/GHSA-mqv7-gxh4-r5vf

How CyberStrike helps

Frequently asked questions

What is CVE-2021-39195?

CVE-2021-39195 is a high-severity vulnerability. It was published on September 7, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2021-39195?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-39195?

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-2021-39195?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-39195 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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