Is CVE-2023-22465 actively exploited?

No active exploitation of CVE-2023-22465 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-22465 be exploited remotely?

Yes. CVE-2023-22465 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-22465?

CVE-2023-22465 has a CVSS score of 5.3 (MEDIUM).

HOME VULNERABILITIESCVE-2023-22465

MEDIUM

CVE-2023-22465

CWE-20Published: January 4, 2023· Updated: Jun 17, 2026

5.3

CVSS v3.1

Official Description

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 parsers are susceptible to a fatal error on certain inputs. In http4s, modeled headers are lazily parsed, so this only applies to services that explicitly request these typed headers. Fixes are released in 0.21.34, 0.22.15, 0.23.17, and 1.0.0-M38. As a workaround, use the weakly typed header interface.

NVD Source

Technical Analysis

CVE-2023-22465 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.