CVE-2021-21321
fastify-reply-from is an npm package which is a fastify plugin to forward the current http request to another server.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.82%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
fastify-reply-from is an npm package which is a fastify plugin to forward the current http request to another server. In fastify-reply-from before version 4.0.2, by crafting a specific URL, it is possible to escape the prefix of the proxied backend service. If the base url of the proxied server is "/pub/", a user expect that accessing "/priv" on the target service would not be possible. In affected versions, it is possible. This is fixed in version 4.0.2.
- CVSS 3.1
- 10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 1.82% probability · 78th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- fastify-reply-from project/fastify-reply-from
- Source
- security-advisories@github.com
References
- https://github.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889Patch, Third Party Advisory
- https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4Third Party Advisory
- https://www.npmjs.com/package/fastify-reply-fromProduct, Third Party Advisory
- https://github.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889Patch, Third Party Advisory
- https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4Third Party Advisory
- https://www.npmjs.com/package/fastify-reply-fromProduct, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.