10

CVE-2021-21322: fastify-http-proxy_project fastify-http-proxy Improper Input Validation

CVSS: 10.0v3.1CriticalModified
AliasesGHSA-c4qr-gmr9-v23w
Published 02-03-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-21322 is a critical (CVSS 10.0) Improper Input Validation vulnerability in fastify-http-proxy_project fastify-http-proxy. EPSS estimates a 1.63% chance of exploitation in the next 30 days, higher than 75.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
10.0/10
010
Critical · v3.1 (CVE.org)
EPSS score
1.63%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-03-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

fastify-http-proxy is an npm package which is a fastify plugin for proxying your http requests to another server, with hooks. 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 4.3.1.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.63%

Chance of exploitation in the next 30 days

Percentile

76%

Versus all other CVEs

30-day change

0.00 pp

From 1.63% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.63%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fastify1 product
Fastify-http-proxy_project1 product
Npm1 product
  • fastify-http-proxy< 4.3.1

3 vendors · 3 products

References

4 links