SSRF in Misskey
CVE-2021-39195
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Misskey
- Misskey-Dev Misskey — versions < 12.90.0
Weakness classification (CWE)
References
- github.com/misskey-dev/misskey/security/advisories/GHSA-mqv7-gxh4-r5vf (Patch, Third Party Advisory, Issue Tracking)
- github.com/misskey-dev/misskey/commit/e1a8b158e04ad567d92d8daf3cc0898ee18f1a2e (Patch, Third Party Advisory)
- github.com/misskey-dev/misskey/blob/develop/CHANGELOG.md (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2021-39195?
- CVE-2021-39195 is a high-severity vulnerability in Misskey, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2021-09-07.
- How severe is CVE-2021-39195?
- High severity. CVSS v3 base score is 7.7 out of 10.