Http4s
Vendor:
First CVE: Mar 25, 2020 · Active for 6 years
7
Total CVEs
More Total CVEs than 83% of tracked products
1.8
Avg CVEs / Year
Higher CVE frequency than 60% of tracked products
6.8
Avg CVSS
Higher Avg CVSS than 36% of tracked products
0.0%
KEV Rate
Bottom 1%
Trends Over Time
The number and severity of CVEs published that impact Http4s over time
Volume of CVEsAvg CVSS Base Score
First CVE
Mar 25, 2020
6 years ago
Most Recent CVE
Sep 23, 2025
304 days ago
CVE Severity & Scoring
Http4s7 CVEs
43%
43%
14%
All CVEs352,294 CVEs
45%
40%
11%
MediumHighCritical
Attack Vector
Local0 (0.0%)
Network7 (100.0%)
Unknown0 (0.0%)
Physical0 (0.0%)
Adjacent Network0 (0.0%)
Attack Complexity
Low7 (100.0%)
High0 (0.0%)
Unknown0 (0.0%)
User Interaction
None6 (85.7%)
Unknown0 (0.0%)
Required1 (14.3%)
Privileges Required
Low0 (0.0%)
High0 (0.0%)
None7 (100.0%)
Unknown0 (0.0%)
Top CVEs
Signals from CVEs in this product scope (7 CVEs).
7 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2021-39185CRITICAL Http4s is a minimal, idiomatic Scala interface for HTTP services. In http4s versions 0.21.26 and prior, 0.22.0 through 0.22.2, 0.23.0, 0.23.1, and 1.0.0-M1 through 1.0.0-M24, the d | Sep 1, 2021 | 9.1 | 26 | NO | NO |
CVE-2020-5280HIGH http4s before versions 0.18.26, 0.20.20, and 0.21.2 has a local file inclusion vulnerability. This vulnerability applies to all users of org.http4s.server.staticcontent.FileService | Mar 25, 2020 | 7.5 | 26 | NO | NO |
CVE-2025-59822HIGH Http4s is a Scala interface for HTTP services. In versions from 1.0.0-M1 to before 1.0.0-M45 and before 0.23.31, http4s is vulnerable to HTTP Request Smuggling due to improper hand | Sep 23, 2025 | 7.5 | 25 | NO | NO |
CVE-2021-21294HIGH Http4s (http4s-blaze-server) is a minimal, idiomatic Scala interface for HTTP services. Http4s before versions 0.21.17, 0.22.0-M2, and 1.0.0-M14 have a vulnerability which can lead | Feb 2, 2021 | 7.5 | 24 | NO | NO |
CVE-2023-22465MEDIUM Http4s is a Scala interface for HTTP services. Starting with version 0.1.0 and prior to versions 0.21.34, 0.22.15, 0.23.17, and 1.0.0-M38, the `User-Agent` and `Server` header pars | Jan 4, 2023 | 5.3 | 20 | NO | NO |
CVE-2021-32643MEDIUM Http4s is a Scala interface for HTTP services. `StaticFile.fromUrl` can leak the presence of a directory on a server when the `URL` scheme is not `file://`, and the URL points to a | May 27, 2021 | 5.8 | 20 | NO | NO |
CVE-2021-41084MEDIUM http4s is an open source scala interface for HTTP. In affected versions http4s is vulnerable to response-splitting or request-splitting attacks when untrusted user input is used to | Sep 21, 2021 | 4.7 | 18 | NO | NO |
Exploit Exposure
Signals from CVEs in this product scope (7 CVEs).
CISA KEV
0 CVEs
0.0% of CVEs· Bottom 1%
Metasploit
0 CVEs
0.0% of CVEs· Bottom 1%
Nuclei
0 CVEs
0.0% of CVEs· Bottom 1%
ExploitDB
0 CVEs
0.0% of CVEs· Bottom 1%
Social Chatter
Signals from CVEs in this product scope (7 CVEs).
Media Mentions
Signals from CVEs in this product scope (7 CVEs).
Top CNAs Publishing CVEs For Http4s
Top CWEs
Versions
| Version | CVE Count | Avg CVSS | Avg EPSS | KEV | Exploits |
|---|---|---|---|---|---|
| 1.0.0 | 5 | 6.5 | 0.8% | 0 | 0 |
| 0.23.1 | 1 | 9.1 | 0.6% | 0 | 0 |
| 0.23.0 | 2 | 7.5 | 1.0% | 0 | 0 |
| 0.22.0 | 1 | 5.8 | 1.4% | 0 | 0 |