Vulnerability Details : CVE-2021-21321
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.
Vulnerability category: Input validation
Exploit prediction scoring system (EPSS) score for CVE-2021-21321
Probability of exploitation activity in the next 30 days: 0.22%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 61 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-21321
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
---|---|---|---|---|---|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST |
10.0
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
3.9
|
6.0
|
NIST |
10.0
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |
3.9
|
5.8
|
GitHub, Inc. |
CWE ids for CVE-2021-21321
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-21321
-
https://www.npmjs.com/package/fastify-reply-from
fastify-reply-from - npmProduct;Third Party Advisory
-
https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4
Prefix escape · Advisory · fastify/fastify-reply-from · GitHubThird Party Advisory
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https://github.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889
Merge pull request from GHSA-qmw8-3v4g-gwj4 · fastify/fastify-reply-from@dea227d · GitHubPatch;Third Party Advisory
Products affected by CVE-2021-21321
- cpe:2.3:a:fastify-reply-from_project:fastify-reply-from:*:*:*:*:*:node.js:*:*